I can't seem to find it, so it either doesn't exist, or got deleted, but didn't Zardon once start a similar thread? And no, I don't mean the one about useful apps, but I seem to recall one he started one regarding the best/useful Mac apps/tools.
The reason I remember this is that there were tips, tweaks, and tools posted in there, including ones on cleaning the library cache (which I think was ClearCaches or Leopard Cache Cleaner), and things like that. I even remember a tool that was posted about Boot Camp. During beta Boot Camp would stop at the MAC/Windows selection screen, which now it doesn't, and I remember a tool/tweak that was posted to force it to come up again so that you no longer have to hold the Alt-Option key to have the option screen come up. It was either
BootPicker, or
rEFIt, just can't remember which one was recommened.
Other programs I remember mentioned (cuz I downloaded them) were Unarchiver, Gimp.app, Quicksilver, and NeoOffice. Those are the ones off the top of my head.
(Hope you're reading this Ryan!)