I'd have to say this one is also one of the most important fixes:
* Fixed issue where Wi-Fi connection was no longer available after resume from sleep
Can you imagine how many people called their PC vendor for tech support with a WiFi card presumably dead? Good thing I kept my mom's notebook on XP. She uses the laptop in the car for her appointments calendar and I have it set to put it to sleep when the lid is closed, so she can quickly open it up and look without wasting power to start up.
I'm shocked something like that made it without being fixed in SP1. Oh well, it's what I've come to expect. I can only imagine
the wonderful problems in Windows 7. MS has promised to fix things that people are telling them need improved... but are we going to see things like GIF support added back in the picture viewer, or a sound system that doesn't suck? Noooo, of course not. The real problems in Windows now are the architectural changes that will unfortunately never be undone.