Marvel Noir takes place on Earth 90214. Here the heroes of the regular Marvel Universe (Earth 616) had appeared decades earlier. Some of the leading titles for the Noir series' were Spider-Man, Iron Man, and X-Men. Most of the Noir books are made of a four-part series of noir comics.
Many standard characters from the main story arcs were also brought along into the 1930's atmosphere. For a better description of these characters' Noir version see their "Alternate Versions" section.
Iron Man Noir:
Luke Cage Noir:
Spider-Man Noir: Eyes Without a Face
X-Men Noir: Mark of Cain
Deadpool Pulp is a lot like the Marvel Noir concept only it takes place in a different world on a later date (after WWII).
In Spider-Man: Shattered Dimensions, there are levels taking place in the Spider-Man Noir universe. Unlike the other Spider-Man characters, in the Noir game-play there is a focus on using stealth to take down your opponents. This game added a 1930's version of the Spider-Man villain Hammerhead as one of its first main bosses. And, while playing as Spider-Man Noir, you must defeat the Noir versions of Vulture and Goblin.