TIGsource is a blog about indie video games that also has a very active forum community of both amateur and professional indie game designers/programmers/artists. About two months ago one of the forum members (Daid) whipped up a tool to display the art images of a particular thread so he could find something, and it turns out it's a pretty great thing just to browse for its own sake, which you can do here. Updated once a day and, obviously, image intensive. [previous tigsource mentions]
When kevin wins, the planet loses! is a tumblr that collects pixel art from a variety of videogames to showcase the beautiful work that lies in the background of the action. [more inside]
Uno Moralez, aka Indi, produces some very disturbing pixel art (much of it definitely NSFW). [more inside]
Kings of Power 4 Billion% [12 min AVI] - A new release from pixel artist Paul Robertson, known for such previous works as the video for "Pirate Baby's Cabana Battle Street Fight 2006" and Architecture in Helinski's "Do The Whirlwind."
"Knytt" is a little pixel platform game that has a suprising amount of ambience in it's simple presentation. You play the Knytt, who was abducted by an alien, and is trying to repair the UFO to get home. Also by the same person, Nifflas, is "Within a Deep Forest" which features "...challenging gameplay, beautiful music, an evil doctor, infinite cuteness, and a deep forest." [more inside]