Just curious if anybody has looked at some of the more specialized searching packages to do an evaluation of them? I'm specifically interested in performance with large indexes > 1 million documents and the ability to handle large numbers of searches in a minute.

Anybody have any experience in this area?

I originally thought that MySQL would be a good idea but I've heard that for my needs, MySQL probably wouldn't do as well in throughput as a binding to a dedicated full-text search engine.