Microsoft Security Updates - April 2009 Patch Now
The April updates are worth emphasizing this month. Applying Automatic Updates or performing this manually soon, would better protect your system. The ISC provides a good summary. They have three rated as "patch now" for exploits circulating in-the-wild.
MS Patch Tuesday Updates for April 2009
http://isc.sans.org/diary.html?storyid=6193
Microsoft Security Updates - April 2009 Patch Now
https://www.microsoft.com/technet/security/bulletin/ms09-apr.mspx
So far so good in applying these updates to my own systems.