I honestly can't remember that I was doing anything extraordinary and it was such a shock when it happened, I just did what it said. It did ask, though, when I restarted, if I wanted to send a report and I did. I have put a few things on here, but no hacks or anything that I didn't find at download.com or versiontracker.com . I'll check out the links, TheAnswer. I did hae RAM put in it when I bought it, but it is PNY brand, which is pretty good and it's two matching sticks, so I'd hope that isn't the problem. If it happens again, though, I'll definitely be getting with the local Apple store where I bought it.
Thanks!