I like the database diagraming tools within SQL Server, however I learned not to use them because they are tied to intimately with the database. In 2005, I built up elaborate diagrams of each schema of the system I work on, but then when it came time to do an entire database refresh into our dev environment from the test environment, I couldn't find a way to export the diagrams out of the database in a way that could be imported back in later after the refresh (refresh was a backup and restore of test database). Does anyone know if they've solved this issue or found a way that I've missed? Untill then, I'll stick with outside tools to do my documentation and diagraming.