Here’s a good guide to some undocumented and/or obscure Google search operators:
If you start your query with allinurl:, Google restricts results to those containing all the query terms you specify in the URL. For example, [ allinurl: google faq ] will return only documents that contain the words “google” and “faq” in the the URL. This functionality can also be obtained through the Advanced Web Search page, under Occurrences.
In URLs, words are often run together. They need not be run together when you’re using allinurl:.
In Google News, the operator allinurl: will return articles whose titles include the terms you specify.
(via MeFi)