I stumbled upon the fact the Vista SP1 beta was recently released and also the fact that there is a hack available the will allow the general public to install this beta. I just wanted to pass my experience along because I found that the SP1 beta cleared up a couple of annoying issues that have really been bugging me since I started using vista 3 months ago.
My computer is a Dell Lattitue D630 with 2GB RAM, Nvidia grapics, 7200 RPM hard drive and core 2 duo 2.2ghz processor runnning Vista premium 32 bit. With this configuration I thought I should have a pretty fast laptop, but my experience was slow boot/resume times and overall lagginess. Below are a list of issues that have been noticably improved after installing SP1:
Resume from sleep is much faster now it take less then 10 seconds to resume from sleep. Previously this could take up to 2 minutes.
More responsive UI, have not noticed any lagginess, I think this was related to some networking fixes in the service pack.
Visual Studio 2005 runs better. I have had nothing but problems with Visual Studio, some days it would work OK and other days it would be super slow to do code complete or syntax highlighting. I think this may have been related to the networking fixes as well.
All in all I have not had any issues with the SP only improvements. I'll be sure to update this post if I run into any SP related issues.