From Secunia http://secunia.com/advisories/24659/
Rating: Extremely critical

Description:
A vulnerability has been reported in Microsoft Windows, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an unspecified error in the handling of animated cursors and can e.g. be exploited by tricking a user into visiting a malicious website using Internet Explorer or opening a malicious e-mail message.

Successful exploitation allows execution of arbitrary code.

NOTE: The vulnerability is currently being actively exploited.

Solution:
Do not browse untrusted sites or view untrusted e-mails.

Yeah, read that this morning. Just another reason not to use IE.

It's not an issue if you use Firefox 2.0 or better.

Thanks Thomas

Thanks Thomas