Office 2007 SP1, WSS 3.0 SP1, and MOSS 2007 SP1 have been released on Microsoft.com
The downloads can be found at: http://technet.microsoft.com/en-us/office/sharepointserver/bb735839.aspx
There are over 600 specific bug fixes across the Office server products and it is highly encouraged to upgrade to this service pack.
Here are links to additional information:
MOSS SP 1 Fixlist KB – http://support.microsoft.com/?id=942390
MOSS SP 1 Description KB – http://support.microsoft.com/?id=936984
WSS SP 1 Fixlist KB – http://support.microsoft.com/?id=942388
WSS SP 1 Description KB – http://support.microsoft.com/?id=936988
How to Deploy SP 1 KB – http://support.microsoft.com/?id=945013
erickraus