I feel that Couch has too much server side programming. It can be off puting sometimes. If anyone wants to make some money, I'd suggest them putting a server on top of a couch cluster that receives mongo queries.

I mean, how hard can it be to

1) Manage some indexes,

2) Keep some metadata around and

3) Build some half-assed single index query planner?

Couch is already a solid piece of technology. It just needs a better API to "sit" on top of it, kinda like what Membase is doing now.

edit: or on top of Riak, Cassandra, PostgreSQL or etc ... on the API side, Mongo has clearly won.

Which is to say, not much?