I’m going through some problems while using snow leopard. I think they might go away after some updates but anyway, here they are.
After some time, my airport just kept turned off when the computer woke up. It was quite annoying since I almost never turn the mac off. The workaround was installing an app, wireless sleeper, that, besides turning the airport on on waking up, turns it off when sleeping. The second part is rather useless, but hey, now I don’t have to turn it on again every time.
I’ve experienced some HUGE slowdowns with Safari. Usually just restarting it gets it back to normal, but sometimes it is really a pain in the ass. Opening a new tab takes about 5 seconds, something that NEVER happened with Leopard.
The exposé is choppy compared to the Leopard version. The command + 1 and command + 2 are welcome, so as the organized look. Maybe it is just bad luck, but it happens quite often to me. Right now I’m with many windows opened and it is working fine, so I have no idea of what is causing that.
Parallels SUCKS. I haven’t upgraded it yet, but as it is there is no better word to describe it: SHIT! Many times slower than what I was getting with Leopard. Restoring the machine state, using the VM, suspending the machine. Everything is soooooo slower than before that it boring.
There is a small glitch with the dock (I use it hidden) and expose, when you call expose while leaving the mouse cursor over an icon and calling and dismissing it again will make the icon “pop up”… sort of… Calling exposé, hovering the mouse over and then out of the dock, and dismissing it will take the glitch away… but anyway… it happens 
It doesn’t bother me at all, but it is noticeable and as people at Apple are concerned with those details, they’ll probably fix it.
I also had some problems with a CalDAV that was working previously, but since I rarely used it, I removed it and can’t see the problem anymore 
My macbook is running a bit hotter than before, but it may be some dust inside it. I have to check it.
Well… I guess I complained a lot, but I absolutely didn’t dislike Snow Leopard. It is stable, fast (most part of the time), has some great features (most of them are details, but I like the way it is) and works pretty well with most of the software I had.
For a first releas, it is very good and I intend to stick with it. Keep up the good job!