I have a Tilt and used this site:
I've had pretty good luck with it. Unlike the freeware, they actually provide support and have a downloads page that you get access to that gives you even more add-ons then most places. I've been using them for awhile and download new add-ons as they come out for free. Plus it's really nice if you like to customize buttons and tweak your phone.
Has anyone downloaded an iPhone skin for their smartphone from a credible place? Did it work ok for your phone?
I like the iPhone's idea, but I want something that still syncs up well with my Microsoft apps on my computer.