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The font seem to be DejaVu Sans, and it's pretty good with proper rendering: http://i.imgur.com/ixI70.png

I looked for an image with a white background http://i.imgur.com/9aTz2.jpg

Yep, this is it. Still full hinting, though.

Really? The blues and oranges tell me its sub-pixel rendering.

Yes, it's subpixel rendering on your screenshot. Hinting is "full" as opposed to "medium" or "slight": http://www.clearevo.com/blog/files/AfterFullHint.png

Ah yes, I see what you mean, sorry!