I've created a new search engine at http://www.cdiggins.com/search/
for doing research on programming languages using the new Google co-op
service. It has an emphasis on programming language theory, but
searches the home pages of over 50 programming languages.
Let me know how it works for you, and if you have suggestions on how
the search results can be tweaked to work better for you.
--
Christopher Diggins
http://www.cdiggins.com