One of my favorite apps to help me keep my life in check is Things by CulturedCode. I'm going to make this brief, as their are thousands of in-depth reviews and how-to's out there.

Things is a GTD app that helps me keep all my lists and to-dos in check. It has "Areas" that allow me to create tasks for work and for home separately. Also, it has the ability to schedule reoccurring tasks, such as paying rent or giving my dog his flea preventative.

The Focus areas are nice, and allow me to see what's coming up, so I can make sure to stay on top of all my tasks.

Overall, it's a well designed, beautiful app with an iPhone app that provides almost all of the same functions. Syncing is easy, though it requires wifi.

This brings me to complaints. I want to be able to sync through a server, even if I have to host it myself, I'd like to be able to sync over the air, remotely. Also, a web GUI would be great, since I don't have a Mac at work. Also, on launch, I'd like to be able to select which Focus area to show. I prefer "Next," not the default, "Today."

I've tried many GTD apps, but this is my favorite overall. Though it has it's shortcomings, it's by far the best on the market. With a couple more features and tweaks, Things could be everything I ever dreamed of.