Microsoft has just posted their security patch bulletin for the month of March. There are no security related updates to worry about this month, so all you sysadmins out there can rest easy. Microsoft did post 6 non-security related updates to SUS/MSUS and Microsoft/Windows Update.
Microsoft also released Service Pack 2 for Windows Server 2003 today. That along with all other updates for your computer can be found on Microsoft/Windows Update.
The next scheduled "Patch Tuesday" is April 10th.