SP1 for SharePoint Foundation 2010 and SharePoint Server 2010 is now available for download:
For known installation issues, visit here. SharePoint product team have also blogged about it here.
While you are waiting for the SharePoint 2010 SP1 bits for download, You can download the SP1 white papers here
You can also read more about what is new in SP1 here (SharePoint Product team blog post)
The white paper highlights the new features and enhancements included in SP1, cumulative updates included in SP1 and also has links to new and updated TechNet content.
Below is the SP1 Configuration database version (14.0.6029.1000)
Some of the cool additions are:
Note: This post will be updated later to include links to download SP1 when it is released.