Yesterday was Day Zero for the Video Active X control vulnerability reported in Security Advisory 972890. Luckily, this only affects XP and Windows Server 2003 users, so those who are on current OS versions are protected. Unfortunately, many, many of you (those running IE on XP or WS2K3) need to go to KB972890 NOW. No, really, go now. Run, do not walk. There are confirmed reports of websites running malicious code against this exploit.
Luckily, the KB has one of those nifty new FixIt buttons. Easy peasey.