Assembly signing has always been a pain because you had to specify a relative path or a full path to a key file in AssemblyInfo.cs such as:
[assembly: AssemblyKeyFile("/Thrifty.Net/Thrifty.snk")]
Well it looks like this is going to get a little better. Now you can specify it in as a project property (and it actually works right). Just go to the properties of your project and click on the signing tab. From there, you can specify the path to the key file. Hopefully, this works better than it did in the past.
Read the complete post at http://www.dotnettipoftheday.com/blog.aspx?id=156