By now you must have heard that today is the release date for the long awaited Service Pack 2 for WSS 3.0 and MOSS 2007 with all its stability improvements and enhancements.
Here's all you need to know and the downloads:
http://support.microsoft.com/kb/953338/ (The Microsoft KB article and links to the SP 2 downloads)
http://www.sharepointjoel.com/Lists/Posts/Post.aspx?ID=217 (Definitive source of SP 2 info)
It'll be interesting to check out the Pre-Upgrade Checker to determine if your current SharePoint is ready for an Upgrade to SharePoint 2010... Very interesting times ahead :-)