runouw.com

I've seen tons of pics of gameplay in levels and I'm just wondering how do you do it?

Depends. For PCs, you hit the Print Screen button on the upper right hand side of your keyboard and then paste into a Word document or something. For Macs, you hit command+shift+3 and the screenshot will appear on your desktop.

To upload, use either ImageShack or Tinypic.

Photobucket uploads pictures quicker, MIC, but the catch is that you have to register. -_-