If you like to Get Things Done and you have a Mac, it's time to fork over some money to the Omni Group for their fantastic personal organization software, OmniFocus. With the new job, I've been in need of a solid GTD tool that will help me track dozens of projects at home, at church, and at work. Since I use one laptop for everything, having my todo list in the computer has been great. It's worth the money to have something that works.
For big project planning, and I mean BIG PROJECTS, I am trying out OmniPlan, the Mac version of Microsoft Project.