Due to PoC exploits that can be easily crafted into more dangerous attacks, the Internet Storm Center has declared a Yellow Alert. Be very cautious with all URLs in emails, IM messages, and on the web.
Internet Explorer Exploit in-the-wild - ISC yellow alert
http://isc.sans.org/diary.php?storyid=1212
Original Advisory
http://secunia.com/advisories/18680/