Shawn Blanc has written an awesome (almost Siracusian) review of OmniFocus
This new version of OmniFocus is more feature-rich while also being cleaner, more organized, and more logical. The design brings a structured peacefulness to the wild animal that is my never-ending task list. And that’s quite a feat, because our to-dos are, by nature, neither structured nor peaceful.
My world lives in Evernote and, so far, I have tried to stay in that platform for my own GTD lite system but I keeping standing on the side of the Omnifocus pool trying to decide whether or not to dive in.
This review has just about convinced me.