Around a year ago I wrote about getting 800mb of space back after installing SP1, and I come to you today with a similar tip for SP2!
This one is not as dramatic as 800mb, but I did gain back around 400mb of disk space.
Just as with SP1, this works by removing backup files made during the service pack install, making it prememnant and impossible to remove. Just keep that one fact in mind.
Just pop open your favorite command prompt, and issue compcln
It will ask you to confirm, and then it’ll get to work. After a couple minutes you’ll have your reclaimed space! (And a permenent SP2 install!)