You might try Logomaker. It's a pretty slick product, very versatile, and when you've finished with the design you pay $99 and get it in several formats so you can use it on your site, for shirt logos, and in printing, etc. Well worth the money IMO. If I had known about them before I used my own blood sweat and tears, (plus bought a gazillion business cards,) I would have used this.
whoops, forgot the link:
http://www.logomaker.com/