MS Paint
Goddamn why the hell does the free software community fail so hard at a SIMPLE GRAPHICAL EDITING TOOL
I mean for crying out loud, GNU Paint doesn't even have undo!
MSPaint? No.
•No layers (not necessary, but very handy)
•Horrible color choosing system
•No transparency
•Ridiculous zooming
•Bad selection tools (!!)
Now if you want a cool tool for spriting, get Pixen.
Pixen? Yes.
•Layers
•Awesome color choosing system
•Transparency
•Good zooming
•Good selection tools
•Tile testing (loops a tile over and over so you can see if it looks good)
•Built in animator.
Oh wait, Pixen only works on Macs. >.> Oh well, I'll keep using Pixen and you keep using MSPaint.