Just a footnote on workspace mappings in TFS 2008 –
while initially there were couple of features planned for Orcas release, only one feature has made it into RTM. Correction: both features are available, see this post discussing the second feature.
In TFS 2008 it is possible to map only one level of the folder hierarchy using wildcard syntax
The mapping above will map only one level of files and folders under $/Project/Source and will not retrieve files contained in sub-folders.
This syntax is nice to have, though I am not sure how useful it is. The same effect can be achieved by using cloaking on sub-folders (though of course wildcard is much more elegant way).