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)
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.