I have deleted the recent video embeds from the posts 3rd rock and Playing for Change. It appears that there is a new virus actns/swif.t that opens in IE or Firefox when the web page displays the embedded video.
Sorry for any inconvenience. I strongly suggest you update your virus software, run a full system scan and do NOT open any pop up windows that might appear. Check with Bleepingcomputer for more information.
UPDATE: Crunch Gear has a bit more information on this virus
It seems to be a trojan that will redirect you to a phishing site to install AntiVirus 2009 which is a malware program and is very difficult to get rid of.
If you get redirected to any strange websites, just don't click on anything.