This lets you search across Bing, Yahoo, and Google at the same time, but you don't which results come from which engine. I did 5 sample queries and only chose Google's once.

Modular search for Django

Whoosh: a fast pure-Python search engine

Curse.com uses this and I'm always looking for an easy way to add search to sites, especially ones that seem to be fully integrated with MySQL.

This full-text search was added by Curse, Inc which have one of the heaviest traffic Django sites. Looks *really* simple to use.