I have seen several emails/blogs about mongodb and 10gen musing over FTS. There are a few projects if i am not mistaken that have "bolted on" FTS to mongo but I

I have seen several emails/blogs about mongodb and 10gen musing over FTS. There are a few projects if i am not mistaken that have "bolted on" FTS to mongo but I do not think they have had the same development/LOE as riak search. But with out playing/testing with all those options I can not speak authoritatively on the topic. FTS no doubt will be an emerging factor in the future in the NOSQL landscape IMHO.