I was considering using MongoDB for a server control panel project, that could scale out.

Anyone have any experience with this? Is it a better fit?

It was interesting to read a multi-part article in MSDN magazine showing how to integrate Mongo with asp.NET code. I grabbed a copy of Mongo, it was easy to install but I haven’t been back to it to see how is is to work with.

I would try Riak, they handle replication, sharing and automatic tracking of node availability.

Not to say mongodb cannot do this, its just more work.