Change Log: https://jira.mongodb.org/browse/SERVER/fixforversion/10596
I'm excited personally because they accepted my super rough patch for polygon geo-spatial search queries. They fixed up the code a lot, but it's still my baby. http://www.mongodb.org/display/DOCS/2.0+Release+Notes#2.0Rel...
We use MySQL extensively on our platform and much of our data is relatively key=>value type stuff. So it makes since for us.
I don't mind migrating our primary business operations to MongoDB (we already have moved some data as a POC), but it would be nice to have our forums supported so when we ultimately create our future MongoDB cluster, I'm not having to manage a MySQL instance for VBforums.
Beyond just 'mongo please', are there features you're looking for?
Especially for smaller projects with a lot of data, it's a little bit annoying that you can't really limit the amount of RAM MongoDB will take.
Using e.g. Mongo and Elasticsearch on the same machine would be a little bit problematic as sooner or later, MongoDB would just take over most of the RAM.
In practice, you generally want your DB server(s) on their own machines if RAM is ever possibly going to be a concern. Any database that constantly has to hit the disk isn't going to perform worth a hill of beans.
"Indexes are often 25% smaller and 25% faster (depends on the use case)"