The ONE thing that makes the first of what I expect will be many, service packs for Windows Vista is that for us unfortunate users (retail beta testers?) of Vista Ultimate is that now one's Internet connection is established immediately instead of five minutes after Vista Ultimate has booted up.
Performance? HA! My startup time is SLOWER now, but I'm confident that Microsoft will label that as being "more secure" by using some new mystery code that we don't see while the PC boots up.