[dansingerman]

We use mongodb as the backend datastore. It has built in location searching which so far has worked really well.

[srjk]

thanks for both your replies.

I have used (and liked) mongodb in the past. Horizontal scalability is important and mongo doesn't have a stable release with sharding. Also, this page http://www.mongodb.org/display/DOCS/Sharding+Upgrading+from+... seems empty.

But, the ease of use is really tempting :)

[dansingerman]

According to http://www.mongodb.org/display/DOCS/Sharding production ready sharding should be available this month.