When Panther was updated was right about when I was thinking of upgrading my hardware to a dual G5 (from a dual G4 1 ghz). Panther gave me such a boost (a little in actual UI speed, but mostly in general efficiency and producivity [exposé, inline searching, etc.], that I didn't feel the need to upgrade the hardware. It'll be interesting to see if Tiger has the same effect or if I'll want to grab a new box to really let it shine.
If Core Image (video) gives a boost to FCP on my current machine, I may just get a new video card and some more RAM and hold out for that 3 GHZ. Still
holding
breath
can't
make
it
much
longer