You've probably seen the announcements by now, but I wanted to let you know that we made Microsoft Office SharePoint Server 2007 SP1 available for download today. You can download the service pack, and you can read through the fixes that are included in the pack.
Updated: A lot more information on the service packs, what's included, and how to download/install is provided on the SharePoint blog. Thanks for the comment Will!
George Perantatos, ECM Program Manager