Microsoft has finally released the much awaited Service Pack 1 for SharePoint. Unfortunately, not all of the links provided on the Microsoft download pages seem to go to the right places. Here are the actual links that I've found.
SharePoint Service Pack 1 Resource Center
Planning and Deployment Guide (Word Document)
Windows SharePoint Services 3.0 SP1 – Download / List of Fixes / Excel
Microsoft 2007 Office Servers (includes MOSS) SP1 – Download / List of Fixes / Excel
SharePoint Designer SP1 – Download / List of Fixes / Excel (includes Office 2007 SP1)
Revised SP1 SDK for WSS / MOSS / AJAX in SharePoint
System Center Operations Manager 2007 Packs – Announcement / Download
The Excel versions of the fixes are far more useful as they include the actual problem fixed rather than links to hotfixes that you have to sift through.
Update: Fixed the Excel links as Microsoft changed all of them overnight. They also split out the changes for WSS from the main Excel file for Office Servers.