Google Sets

Another Google Labs beta, Google Sets allows you to enter a set of words and Google will attempt to expand that set to include other related terms. Example: enter three song titles by one artist, and you'll get a whole load more. Each resutl is clickable to run a search on that term. I've found it quite successful, but it could do with some sort of set restriction, perhaps: I'd like to enter three song titles and an "AND" album title to see just the songs on that album. Since Dictionary.com started spewing popups all over my screen I've converted to Google Glossary.
(From Google Labs)