I personally use Adobe Photoshop CS for all of my designs. CS is priced at around $400 or so tho, but I did find a site that sells it for $100, I got mine from there, the only problem is the lady you have to call to activate the program, she keeps putting you on hold(5 times for me). MSpaint is good for pixel sigs but you can only "undo" so much. Look around on http://www.download.com for some free designing programs. PS:The site I bought mine from for $100 is no longer running, uh oh. It was a fully leagal version, they just bought software in bundles, that way they could sell them for a cheaper price.