This has probably been covered on MacFixit and I missed it, but...
I've been having noticeable Finder problems lately, mostly related to iDisk and SD cards. Ejecting them will sometimes cause the Finder to freeze -- the SD card issue being the worst, as the Finder never recovers -- and the refresh rate is appallingly slow. During iDisk usage, occasionally new desktop files won't appear until I've cycled through a number of Finder windows.
Tiger has been okay for me so far. I never noticed a lot of the bugs (the "Get Info" one, for instance) in earlier versions. But I'm really hoping that 10.4.3 is *the* fix and all others are just feature enhancements. I've never quite reached the bliss that I personally had with 10.2.9.