Since no one commented on mine
, I'll just give you some tips, assuming mine is perfect in every way.
1st, when your resizing an image, please, if all you have is mspaint, get ifranview or something, it's a completely free and small program that will do an excellent job resizing images, that resized gp2x on the left looks terrible because of it's jagged edges.
2nd. I do like how you centered the logo.
3rd. If you are working with MSPaint, and can't afford Paint\Photoshop, get GIMP or Paint.net. Also, look at other banners and how they get information across, people have a better chance of seeing flashing words or short to the point words than having to stop and read something.
4th. Don't get discouraged, a lot of people will try to shoot you down instead of trying to see past the "sub-par" work and into the fact that atleast you tried to do something for the community. Just keep trying, and practicing, I find it's best to show some of your closer friends your work first, and get their honest opinions, then, when you finally think you have a winner, post it.