First - I'm a windows user.
Second - I have to say I'm a GTD fan but not an absolute by-the-book adopter. Like most people (I assume) I pick and choose how I use systems like this. Thinking Rock seems to let me use it the way I like and not force me to use it in ways I don't want to.
I've tried several GTD programs and checked out many more. Thinking Rock is the best I've found so far.
I love that you can see all the actions on one screen and sort by columns - not only that sort by multiple columns!
I love that it's easy to make an action without assigning it to a project or a context.
I like that you can delegate things to people and track that.
I like that you can run it on a thumb drive.
Way to go guys! Can't wait for v2.0 and I'll gladly pay for it.