I hope to begin writing the new framework for all of the sites within a few weeks.

I have downloaded and will soon begin evaluating the LINQ to SQL Plinqo (http://plinqo.com) and potentially CodeSmith.

So, if anyone has any insights regarding these technologies, or has other recommendations for a general codebase, please send an email to email@yadayahweh.com or post it here in this thread.
I'm not looking for a DotNetNuke or anything like that that attempts to provide out-of-the-box functionality through 3rd-party modules. They rarely if ever prove to be as flexible to use as I need them to be, and I end up working more to work within / customize those constructs than it would have taken to write the whole thing myself.

Will keep everyone up-to-date with my progress.

Yow'el