I created a project, source code not available yet, that will enable DotNetNuke portal hosts to install this PA and utilize SubSonic to administer 1 or more databases. The only caveat is that the SubSonic configuration section will have to be added, which is very simple to do. Follow the configuration section in this PDF by Scott Kuhl.
Go here to download the PA or go to "My Files" then to the SubSonic subfolder.
The current release version is using a change set made after SubSonic beta 3 (change set 21470). Anything previous than this change set won't work because the SubSonic scaffold was utilizing url redirection. I would like to thank Eric Kemp for enabling form postback in the scaffold for this to work.
[UPDATE: I recently posted a more indepth post. Go here to read more: SubSonic & DotNetNuke - In Action /]
-Thames