Wow... Panda online scan found 9 new viruses that AVG and TrendMicro didn't catch. Oddly enough, one of the viruses (Java exploit: ByteVerify) has been found by both scanners before, but Panda detected 6 (!) more instances of it in the java application data. It also found IRC.Sdbot.Drp in Mozilla's application data (interesting since I've never used IRC), Classloader.B in sun java application data, and Downloader.CL in the same location. Fortunately my security settings (hardware and software firewalls, plus service tweaks and security policy edits) are locked down tighter than they should be, so they probably didn't cause much (if any) damage. I'm totally adding this scanner to my schedule.
My virus/spyware/adware schedule:
Nightly update/run of AVG6 (scheduled at 4am)
Weekly update/scan of Adaware/Spybot
Bi-weekly scan using Trendmicro's Housecall (and now Panda's online scan, too)