Vista SP1 is now available to the public via Windows Update or the through the regular download channels. But there seems to be some problems with certain drivers which you might need to update as mentioned in this post.
Both the U1010 and P1610 have already been updated, it's hard for me to tell if there's any significant performance increase yet, but the U1010 seems to wake up from sleep to the password screen pretty much instantly.
But the most immediate benefit was after installing Vista SP1, hard disk space got freed, I think at least 1.5GB. On my space starved system drive of the P1610, that was a god send!
[Update] I figured out why i got space during the install. Seems like all System restore points prior to the installation of SP1 has been deleted. So that explains a lot.