I’m mostly posting this here for my own sake, but perhaps someone else is having the issue out there too.
Basically, my computer rebooted unexpectedly today (first time in a long time), so I whipped open the Event Viewer to see what happened. Well, to my surprise, the Event Viewer logs hadn’t been updated since November, 2004. That was quite a surprise to me, that’s for sure. I’m not sure if this stopped working when I installed SP2 or what, but it was an easy fix. Basically, I went into the properties for each log (right click the log in Event Viewer and select Properties), and chose the option “Overwrite events as needed” and cleared the logs. Once I did that, everything started working normally. Oh well! Most likely, I probably did something stupid a while ago that hosed it. At least it’s working now!