Google Code Search
Google have recently launched a new tool for searching through the massive repositories of source code available on the Internet, though with the rather unimaginative name of Google Code Search.
I’m particularly impressed that the search includes CVS and Subversion repositories, as this is far more useful than a general Google search which would only really cover code embedded in web pages or perhaps PDF/Word documents. Being able to use regular expressions and restrict searches to particular licences, files and packages is also highly useful.