The Chandler Project, the ever-more-delayed PIM - "personal information manager" - is now 1.0. Here's the release notes. 
It's what most people now see as a "GTD" app, only when they started building it back before normal people started using the Internet. Only like other GTD apps, it's feature-to-bloat ratio isn't very good. Imagine if you took iCal and OmniFocus, hacked them together with all the grace of Microsoft Outlook and made it take a long time to start up and shut down.
You can now get to-do list managers built on top of outliners and text editors, and they are generally very fast. I've been using Things.app on the Mac, and have been building a command line interface for it, mostly so that when I'm using my Palm Pilot or any of the other computers in my house, I can add stuff to my inbox. And we bind these things together very lightly - text, XML, Git and HTTP. CalDAV is for grandma.
Chandler lasted all of five minutes on my machine. Sorry guys - good luck and everything, but not for me.
