What kind of tools is your favorite in Photoshop?  

clone stamp ftw :D

Definitely an excellent question. As a graphic designer, I am grateful for all the amazing tools in Photoshop and how far they've come over the years. CS5 is absolutely amazing, and I don't know if I have an answer to this question. The pen tool is definitely the most invaluable tool, as you can do literally anything with it. But I also love the customizable brushes and the limitless possibilities their, all the tools for retouching and fixing photos. It's difficult to say, because it depends on exactly what I am doing. Whether I am creating a design from a blank sheet or editing a photo I've taken. I use all sorts of different tools and presets for different projects, and I don't know if I could choose a personal favorite.

I enjoy using brush tool. i love downloading brushes from deviantart. it's pretty cool when you mix several brushes.

and the magnetic tool? i forgot its name. but the one with magnetic. lol. then using feathers too make its sides smooth.

I like pen tool + warp the best!
You can make really interesting things with it :)