Most SBSers are aware that WSS SP2 and Office 2003 SP2 shipped yesterday.  The question inevitably comes up in the forums and newsgroups, "can I install these SPs on SBS?".  The answer is an unequivocal 'yes'.  Unless there is a specific warning in the readme or "Description of x SP y" Knowledge Base article, it is generally safe to install the service pack on your SBS machine (after making a full backup, of course <g>).  Relevant articles:

Windows SharePoint Services (WSS) KB article

Office SP2 download site

While we're at it, my favorite new feature is the Outlook anti-phishing functionality.  To get it, you need SP2 and the latest junk e-mail filter updates available here:

http://support.microsoft.com/kb/872976