There are a number of critical patches in the Microsoft Security Bulletin that was published on August 8th.  For the full bulletin please click here.  However, I want to particularily draw your attention to the following update Microsoft Security Bulletin MS06-040 which resolves several vulnerabilities in the Server service that could allow remote code execution.  So my advise to you is to get patching ASAP!

If you are not receiving these security bulletins on a monthly basis you should sign up here to receive them.