Several things stopped us from switching to ASP.NET 3.5:

1) Possible low penetration. Yes, we still have users who ask if our web based helpdesk software is compatible with MS SQL 2000 or even MS SQL 7.

2) Joel's rule - "never move to a new framework just because it's a new framework".

Now, when 3.5 has been here for a while, with even a Service Pack released, and when MS has almost shipped Visual Studio 2010 and ASP.NET 4.0, the reason #1 makes no sense anymore. And the new features of 3.5 - for instance, AJAX-scripting and LINQ - are beneficial for both our end users and the development team. This eliminates reason #2.

Please welcome - the latest version of Jitbit's web-based help-desk is based on ASP.NET 3.5.