Why not let your customers test-drive your application in a virtual image?

Not only that the Virtual Hard Disk (VHD) file format is now part of the Open Specification Promise (OSP), there is also a program that allows you to give a VHD to your customers with Microsoft and your software installed for evaluation purposes [2].

I think that is really cool and hat makes it very easy and comfortable for the potential buyer: no more installations, and you can put some sample data in there as well.

[1] www.microsoft.com/interop/osp/default.mspx

[2] www.microsoft.com/technet/try/vhd/partners.mspx