Earth 3 and Kingdom Come... 

I love how Elseworlds where brought back but now as so called alternated "universes" in the larger multiverse.
 
But wait...since when did the Tangent universe become part of the 52? (sorry but I missed it!)
Wasn't it supposed to be a "tanget" dimension like Hell is for the DCU? Not part of the 52??
That's why it appeared and crossed over with the main universe a couple of times before we had these 52 universes revealed!

I love Earth 22, but what they've done so far, I don't want them spoiling it, so leave it the way it is. I would rather read something I don't know much about. Like Earth 32. Or Earth 3.

Earth 32 sounds pretty cool, but i kind of like the Crime Syndicate stuff. big fan of evil

As far as villain run series go, DC also had Kobra. Over at Marvel, there was Super Villain Team-Up, which I believe grew out of the Dr. Doom feature in Astonishing Tales.

I need more steampunk, bring a Gotham by Gaslight JLA

Earth 32 is truly awesome.  I wouldn't mind seeing Dark Knight Returns (the original NOT that ghastly sequel) and Kingdom Come.  I think my favorites my be the Crime Syndicate or even Gotham by Gaslight, which, since I like historical figures, and it includes Jack the Ripper, had an extra appeal to me

Earth 3 and Earth 22

Kingdom come.

i really like kingdom come and DKR, but i think they need to be left alone...
 
I think the world with the best potential for an ongoing series would be Earth-3. It would be nice to see some of our favorite villains leading the underground resistance movement to topple the Crime Syndicate although they wouldn't ever succeed :-(
 
but i also think your idea for earth-32 sounds cool, i would check that one out

" Earth 32 sounds cool I would get that if they give it an on-going "

Not sure why this happens but fixing, 

The world where Superman stayed dead Batman's back stayed broken and Paralax is the main villian and there are four Superman's and there's a blue lightning Superman. and Azrael is still Batman. basically just the best stuff dc has done up untill 52 and they should do it in a fifty two format. but not a book a week cause the story and art suffered at they end of the 52 series.

All of the ones I would want to see in a seires have been put here already. But yeah it's nice to see different spins on classic characters

DC should do something like Age Of X

I don't know if it's one of the official 52 Earths, but I loved the idea of Generations

 Where to start... I LOVE Elseworlds, and I'd love to see books that feature some of my favorite storylines, but I would NOT want there to be any crossover with other continuities. I like Elseworlds because they aren't complicated, they're self contained. You take your knowledge of the mainstream universe going in, and that makes it so the writers don't have to spell out every little detail. So with that proviso in place, I'd like to see these books get ongoing/miniseries runs. 
  
Gotham By Gaslight I like the almost steampunk, victorian aesthetic, and there's plenty of villains and other heroes to work in. How about Robin as a child laborer or a street urchin, instead of acrobat?  
 
On a similar note, Wonder Woman: Amazonia, in fact if it wasn't for the fact that they both use Jack the Ripper as the antagonist in VERY different ways, I'd think these worlds would look great together (see here). 
 
I was just reading Batman: In Darkest Knight last night, and thinking how much I'd love to see more development of the villains that are kinda hastily thrown in, same with the supporting heroes. 
 
Same thing with Superman: Speeding Bullets. The thing about this one is because of the ending, I'm not sure it would turn out how I'd want it. I want a lot more Kal-El as Batman, and without totally ruining it, I'm not sure that would be able to be worked in to the canon established just based on timeline. As a total side note, I really liked some of the details of the batsuit in this story. Like the padding around the neck, and the overall more durable look to it. Plus I'm a fan of the full face mask. It was the ONE part of the first Az-Bats redesign from the 90s I liked. 
 
Anyone who says Superman Red Son, you're wrong. Sorry. It wouldn't work. It was too perfect of a story to continue. It was a good length, sure it could've used a Flash cameo, or something, but it established all the characters really well, tied up all the loose strings related to the main characters, there's nothing more to do in that universe that wouldn't seem exploitative. It would be milking them for cash at the expense of quality. 
 
Batman: Year 100 was interesting. I feel like I'd want to get to know these characters BEFORE the storyline started. 
 
I didn't read much of 52, but I know there are a few universes that superficially look neat. Like the gender-swapped universe (Earth-11 according to Wikipedia), and maybe the universe where Batman avenged Jason Todd's death.

Earth 3 (CSA), Earth 22(Kingdom Come), Earth 50 (Wildstorm) 
 
Although I like the idea of some elements of Wildstorm being written into DCU continuity.  I think the Kingdom Come and CSA are my 1 and 2.  

Earth 3 & Earth 22 are no brainers. I'd like to see earth 3 as a mature, vertigo title though. That way they can really push the envelope. And if DC's ever gong to have an "ultimate" universe it should be firmly based in Kingdom Come. Such a wealth of rich characters and concepts that have yet to be mined. Great call on Earth 32, due to the Corps War stuff this could really, really work out well. I loved how The Batman & B&B series played with the idea of Bruce wielding a power ring and I think that series could more or less write itself. 

earth 3. If the last few years have taught us anything, its that villains are fun. E3 could get at least a good year out of a mature comic.

" @spider-man 2996: Same here....Dick Grayson can also pull of a GL Look:
 

Also...I think that EARTH-3 would be has good is bad and bad is good (I was still surprised that DUELA DENT was from EARTH-3.....TALON's current where-abouts are still unknown, and ENGIMA's connection to DUELA is still a bit confusing...) "

I'd love to see Earth 32.

I would buy a series of Earth 11 just love the idea of the change gender heroes... :D

I can't remember it's number, but the Earth where all the genders were reversed. 

" I would buy a series of Earth 11 just love the idea of the change gender heroes... :D "