I have been working with distributed caching for about 4 years now, using memcached as the only server.

I have been trying out different memcached clients, and some have been good, others bad.

They have all had the same problem: They have been syncronous implemented, i.e. they have been wasting a lot of theads on simple waits.

I have started a project to create a fully asyncronous memcached client in .NET.

Check out:

http://asyncmemcached.codeplex.com/

Its not production code yet, but its a fully working client, for gets/sets. It just needs some additional features, and I will release a version.