If you have to build your own flavor of EntLib and it needs to be signed things can get complicated. Because of the dependencies between projects you end up having to touch nearly all of the projects. In fact you even have to edit some of the AssemblyInfo.cs files to doctor up the InternalsVisibleTo attributes by adding the public key.
You can do this by hand, or you can buy a short little program from for $5 that will do it in about ten seconds. I've tested it with the 2006 release of Enterprise Library and the new May 3.0 release.
If you're interested PayPal $5.00 to jakew@guerillaprogrammer.com and I'll ship you a zip file with the project and instructions on how to use it.
I know this is a crappy way to release a 'product' but it's quick and dirty and things have to start somewhere. I'll get a real store front setup this week so I can be a little less lame.