The Computer with no name has passed...

[Ghoulish Delight]

Okay, this obviously comes from a biased source, but I just found an early review of SP1 beta:

I've also taken notice to improvements in overall responsiveness of my PCs. Improvements were also noticeable in resuming from Hibernation or Sleep on both my desktop PC and laptop running SP1. I discovered copying files from one directory to another is a bit faster. And on my laptop - battery life seems to be improved since running SP1. I have also noticed that transferring files to my shares on my Windows Home Server are a bit faster than they were previously without SP1. Overall performance in accessing my mapped network shares is improved as well. I store quite a bit of data on my Windows Home Server so this was a huge plus for me. These are just some of the performance improvements I've seen running SP1 so far.

So, that would be a precise list of the issues we have on our laptop. So I'll be definitely trying SP1 when it releases (actually, I have access to the beta, but no thanks).

ETA: Oh hey look, RC1 was made available publicly yesterday! That I might be willing to give a whirl.