As part of that commitment, SlimDX now has full Direct3D 10.1 support. It will be part of our next release, which looks like it will be August 09 at this point. Although nobody specifically asked for 10.1, it's a very useful API in its own right. Sure it adds some features, but just like DirectX 11, it has feature levels. In other words, even though DirectX 10 requires DX10 class hardware, 10.1 works on DX9 or 10 hardware! The caveat is that Vista SP1 or later is required, but if that's an acceptable limitation, 10.1 is great to have for that reason alone.
And as always, if you find missing features or bugs or whatever, let us know! D3D 10 is in use by several of our customers in production environments, and we're determined to continue being the single best option for using it from C#, VB.NET, or anything else in the .NET ecosystem.