Here's my SP2 story. I downloaded it yesterday, then restarted the computer. Everything worked fine, except for one little detail.
My DSL modem had stopped working. The computer no longer recognized it. It's an Alcatel.
After some time with the support guys at Bellsouth, I downloaded (by dial-up!) their latest driver. It was 4.3 mgb, and it took forever. I had forgotten the misery of downloads by dial-up. The driver installed just fine, but the computer still won't recognize the Alcatel. After another hour or so with the tech guys, and disconnecting, uninstalling, re-installing, re-connecting, restarting, etc. (you know how that is) I'm still out of luck. So they're sending me a newer DSL modem. Meanwhile, I'm working on a dial-up connection. Not much fun.
I had a similar issue with my Mom's computer. She also has an Alcatel DSL modem. For some reason, the USB drivers for the Alcatel were really flaky. I solved the issue by installing an inexpensive ($15) PCI Ethernet adapter and eliminating the USB connection between the PC and the Alcatel. The only problem with doing this is that the Alcatel doesn't play well with a typical network (IMHO, BellSouth is playing games to get people to pay for additional DSL modems rather than use NAT). You probably want to read this article if you contemplate going the route that I took:
http://www.tech-company.com/lan/bsfa.html. I didn't trust the Alcatel firewall, so I put a LinkSys firewall/router between my Mom's PC and the Alcatel modem. This requires a little tweaking to get it right. Read the article. Cost me about $80 to get everything running properly. And Mom is now happy with the perf/security. Hope that helps.
I forgot to add: If you network your PC in the way that I did, it makes it really easy to connect more than one machine to the LinkSys (BellSouth won't support you -- but who cares). I believe that the Alcatel modem is designed to either use the USB port or the CAT5 port -- but not both. So don't leave the USB connector attached if you plan on connecting the LinkSys (or Netgear or whatever other router you use) because the CAT5 port will be disabled.