Good post. I solved my mongo full text search problems 2 weeks ago using Ruby's Sunspot gem http://outoftime.github.com/sunspot/.

I walked through this tutorial http://masonoise.wordpress.com/2010/02/06/using-sunspot-for-... on using Sunspot with Redis and had it working with Mongo in under an hour.

Awesome tip, thanks for pointing this out!

For production ready, scalable FTS, you might be interested in Lucandra: http://github.com/tjake/Lucandra, which powers the http://sparse.ly/ twitter search site.

Higher level overview of Lucandra: http://blog.sematext.com/2010/02/09/lucandra-a-cassandra-bas...