You can now find documentation about how to configure Microsoft Office SharePoint Server 2007 (also referred to as MOSS) as a claims-aware application in your ADFS environment from two different sources. The first is official documentation that comes directly from the Office documentation team about How to Configure Web SSO with SharePoint Server 2007 and ADFS.
The second source for this information can be found up on Jim Simonet's new blog. Jim's first blog article tackles How to make MOSS a claims-aware application in ADFS and includes screen shots. Jim has been providing technical support to customers using ADFS since it was first made available, so he has great insight into common configuration issues. His blog should definitely be worth watching!