Might have had it, not sure. Typical signs, changed start page and kept opening random ad pages. Mine triggered zonealarm, and with the help of a registry cleaner (and a dos boot to delete the actual file) it was gone. Maybe it was an older one, but the file(can't remember name) was causing problems on every security website and board I could fine.
It got through ZoneAlarm, Spybot, Avast AV, and AdAware, although AdAware did pick it up as a running program. Very nasty, caused me to go back to mozilla most of the time. (got lazy and started using IE)
EDIT: Thanks for the links, a nice couple of programs.