The best thing about free is...well it's free. I'm still a die-hard Mac fan so I had to post this. When I find one for PCs I'll post it. As one commentator pointed out, this list was compiled awhile ago.
Need to know what Mac system you're working with? We are getting rid of them over time but believe me they are still around. How much memory can you install and what type? How do you reset the PRAM? When was the model discontinued? This is the app to help you with all of those questions and more.
I think AppFresh was on the last image. It's a great way to keep up on the most recent updates available for apps, widgets, and plugins. Be careful though, a few glitches you may encounter when:
-the update requires an OS update i.e. Leopard to Snow Leopard
-the update requires a new license the District doesn't own
-the app goes from freeware to shareware
Have you tried wireless streaming from your Mac to the Apple TV. I started watching Matrix Reloaded on my MBP(in iTunes) and decided to finish it the ATV2. I didn't try mirroring yet.