I am writing a series of articles to illustrate ways to integrate Salesforce with .Net.  Below are links to the first two articles.  The third artcile on Callouts will be publish in the next couple of weeks.  Please let me know your thoughts.

http://www.developer.com/net/net/salesforce-integration-with-.net-web-services-soap-api-.html?comment=53310-5710

http://www.developer.com/net/net/salesforce-integration-with-.net-custom-web-services.html

(the link to the .Net code for this should be uploaded on the site soon.  If you would like a copy, then please let me know and I can email it to you).

Thanks,
Darren