I’ll be honest I didn’t follow beyond this basic example but I see its usefulness value.

Use Visual Studio 2005 to build CRM Callouts!

Only this one looks to be fairly solid.

UserVoice – Customer Feedback 2.0 – Harness the ideas of your customers.  Build great products.  Turn customers into champions.

Here’s another I saw in Website Magazine, 4Q Survey (dot com).