QuickSwitch is open sourced
A little over two years ago I stopped working on my startup company, and took a job with the big New York bank. The one product I managed to release, QuickSwitch, sat on hard drives without updates or product support.
It wasn't doing anyone any good in the form, so I removed the product-ization aspects of the code, the licensing, the obfuscation, and related matters. You can find the source on http://www.codeplex.com/QuickSwitch
Reviewing one's code from two years ago can be a bit of a shock. I use to switch back and forth between C# and VB without missing a beat. But now even reading VB is a little bit hard on my eyes. So be forewarned, if you're interested in taking a look the UI is in visual basic, the interop layer is in C#.