One tool you might want to look at is Pragmatic works BI Documenter http://pragmaticworks.com/Products/BI-Documenter.aspx

It isnt too bad, and you can download a free 14 day evaluation.

We had mixed results in our testing but that was with a version from a couple of years ago, and it looks to have matured a bit, in the end it was a helpful starting point especially when you have a lot of reports and SSIS packages to trawl through.

It also creates either HTML or CHM files for you to browse through.