Wow, its been a while so there should be a lot here but unfortunately I'm just running around like a chicken with my head cut off so I really don't have time. Quickly here we go!
1. Tracks is awesome! I installed on my ubuntu server a few weeks ago and I love it. It is one of the very few applications that I enjoy using more than a desktop application.
2. Mediawiki install was painless and enjoyable, I recommend it for a personal notebook if you're looking for a web based solution.
3. I've been uh...beta testing Leopard and so far so good. Yes its still beta but I'm in love with spaces. However to be honest, thats pretty much the only thing that really excites me. Everything else is just icing on the cake really.
4. Ruby on rails....AWESOME...period. I dropped it for a while because I didn't have time for it and honestly I don't have time for it but I have a small project that I needed to do for work and ruby on rails fit the bill perfectly. I started the project in php, spent about 12 hours on it, then decided to try it with ROR. I literally have worked on it for about 8 hours now and I have about 6x as much done as I did in php. Wow, I need to learn this language from to back!

Anyway, must be on now.