@Pixel_Dailies gives you a theme or subject every day for you to draw. They retweet and blog their favorites each day. The art club just had its first birthday.
Dinofarm Games explain why the demand for higher definition graphics have led them to abandon pixel art... over the course of a wonderfully explained, beautifully illustrated, and clearly demonstrated love letter to pixel art.
The Pixel Painter is a short documentary about Hal Lasko, a 97-year-old artist who paints in Microsoft Paint. [more inside]
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]
Everyone loves pixel art.
The complete guide to isometric pixel art - from the basic line to the interior of a kitchen, now you can produce your very own eboy-scapes...