I’ve written a small wrap around the DevIL image library .
It allows any .NET program (VB.NET, C#, etc) to open and save files in all formats supported by the DevIL library (most notably it can open PSD, PSP, TGA and DDS – yes it can directly open Photoshop files ;)). Also it opens them as System.Drawing.Bitmap objects, so that it works optimally with existing code.
Also it is very simple to use.
Minor bugfix, and uploaded samples of C# and VB.NET code