Here's a new project which provides a .NET interface to GapiDraw:
We took the outdated Intuitex library and fixed it up for GapiDraw 4.0 and improved some parts of it.
We're still working on it but it already works great for us so far (we mostly use GapiDisplay+GapiSurface+GapiRGBASurface).
There are a couple simple demo projects which you can load up into VS 2008 and "Just hit F5" to get going for a starting point.
Check it out and if you'd like to help the effort, let me know!