When I select "This List" in the Search function and search a document library, I get the expected results, but if I do the same with a list (for example, a contacts list), I get "No results matching your search were found."
The Advanced Settings for the list allows items to be searched and searching using "This Site" returns the list items correctly.
Edit 2011-01-26: It seems that if I have a contacts list
and search "This List" for "Malone", the search URL is:
The "u" parameter "http%3a%2f%2fservername%2fSales+Contacts" translates to "http://servername/Sales+Contacts", missing the "/Lists". If I change the parameter to "http%3a%2f%2fservername%2fLists%2fSales+Contacts" it works! This would explain why document libraries are still searchable; they reside directly below the site.
So the question now is - why is it leaving out "/Lists"?