Hardcore Doctor Who fans refuse to call the Doctor a superhero, but it's obvious... I always think of him as essentially the British Superman, and considering what they did in the new series (destroying his home planet), he's becoming even more like superman...

He sure is super.  And he id definitely a hero.  But he is not a superhero.  He doesn't fly or travel through time without means of gadgets or the TARDIS.  And he doesn't wear his underwear on the outside. 

But he is definitely super :)

he can heal himself at will, and is over 900 years old. and he's got a sonic screwdriver. yep, he's a superhero.

"he can heal himself at will, and is over 900 years old."

He could be seen as such, but seeing as how he doesn't wear tights or really have a secret identity [unless you count his real name] then no.

" @xerox-kitty:     Actually he has superhuman healing abilities besides his ability to regenerate.  Also, is wearing tights somehow required to be a superhero?  And so what if he relies on gadgets, so does batman... "

He's more of an adventurer 

He's cool, The Doctor's cool. And that's good enough for me :P

" @Kamen Rider Kajiki: by that logic superman wouldn't be a super hero given that all his abilities are natural to all kryptonians under a yellow sun "

i think hes just a doctor

Really what's the definition of a superhero anyway.... IMO, there's only 2...
 
You have to be SUPER... either have superhuman abilities or have access to tech or magic that gives you those abilities...
You have to be a HERO... being actively involved in helping/saving innocent people...
 
The Doctor definitely qualifies in my book.  Just because he's a traveler doesn't make a difference.  He's probably saved the universe, the earth, and countless other planets more then Superman did.

Do you really want me to list all of the Doctor's abilities? I've seen every episode since 1963 btw so my exposure to the universe is pretty darn good.... lets see... 
 
Ability to cheat death by regenerating body into a different form 
rapid healing ability 
ability to go long periods without breathing 
superhuman intelligence 
mastery of all aspects of time and temporal mechanics 
mind control powers 
 
and thats just his innate abilities... his sonic screwdriver can: 
 
open any lock except wooden or deadlocked  
remotely control or disrupt nearly any mechanical or electronic device 
can be used as a sensor to pretty much detect anything 
 
The TARDIS can: 
 
Travel to any point in space and time 
Tow whole planets across the universe 
Travel to parallel universes 
Nearly indestructible shielding 
and countless other abilities as the plot requires.. 
 
The Doctor is actually more like a god then anything else... but regardless hes definitely a super hero

" @xerox-kitty:     Actually he has superhuman healing abilities besides his ability to regenerate.  "

If Batman and Ironman are superheros. then so is the doctor. Cool gadgets, awesome transport, crazy costume, he even has an oath to go with his adopted name. Never cruel or cowardly

Never give up, never give in.

In both the episodes Inferno and Planet of the Daleks, the Doctor went into a healing coma when the damage taken wasn't enough to be worth regenerating. He's also quite a bit more tough than a human, as evidence by punching a door down in the TV Movie, bending prison bars while as the Third Doctor, and falling a long way and hitting the ground during End of Time.