I'm extremely anxious to see Snow Leopard demoed, but will still continue to hold my trigger finger. Mainly, because I'm running a 2.5-year-old Macbook Pro with pretty poor disk performance, especially noticed since iLife '09 came out. I'm sure this is because I upgraded the stock 5400RPM 160GB drive to one of the first 5400RPM 500GB drives that came out. When I say poor, I mean it. It takes 2 minutes to load my iPhoto library up, and when backing up my DVD's Handbrake gets maybe 5-10 FPS whereas a white plastic Macbook that's a year older with half the RAM gets 12-15fps. iMovie makes me hurt, even though I'm working on a 7200RPM Firewire 400 drive. And I just formatted and reinstalled Leopard.
IF I can convince the powers that be at the office to get a Snow Leopard family pack for the work systems I'll be able to upgrade, but I just don't think I'm going to see enough of a performance boost from even Snow Leopard to fix my speed issues.
So I'm going to wait for the i5 or i7-based iMacs to come out (in all honesty, the Macbook Pro sits docked happily at my desk 95% of the time) sell my Macbook Pro/23" Cinema Display, and upgrade to the 24" iMac with a 1TB drive or, if the fortune gods are smiling down on me, a 512GB SSD and keep my media library on an external drive that I can also use with an

TV. Hopefully sometime after that Apple will release a respectable Netbook-alike that I can use to meet that other 5% that I need to be mobile.
And then, of course... I'll spend the rest of my life in the poor house, but not before walking quietly into the corner since nobody will give a hoot about anything I just wrote.