Photoshop CS3 has alot of new tools take make life alot easier to make changes and edits to photo's. Don't get caught with an illegal copy or it could cost you ALOT!
I agree with Bobbie. If you get software from Limewire, its illegal. Beyond that, there's a real good chance it will have a virus or some other sneaky little piece of maleware attached. By the time you lose every file you ever had (including every picture) and buy yourself a new computer because the infected one is cactus, that may turn out to be the most expensive "free" program you've ever seen.