If you are already doing workflow development with Microsoft Office SharePoint Server 2007 and Visual Studio 2005 - you should definitely download the latest update of the ECM Starter Kit Beta2 TR version from the ECM blog - Excerpt:
The ECM Starter Kit updated for B2TR is in the process of being published to MSDN. But in the meantime, just thought I'd post an "unofficial" version.
The samples are pretty much the same as in the Beta 2 kit, but there are a few additions:
Whitepaper: How to Add Activities to SharePoint Designer
Records Management Sample: Sample Barcode Generator
ECM Workflow Activity: FindManager activity
Also, the workflow templates come with some WSP solution package files to help with bundling workflows for deployment on production servers.
Also make sure that you first install the corresponding Microsoft Visual Studio 2005 extensions for Windows Workflow Foundation Release Candidate 5