I have modified this module to do two things:

Allow anonymous checkout (will create the user's account just like ubercart normally handles the process)
Integrate with the new uc_recurring module. (http://drupal.org/project/uc_recurring)

As far as the recurring billing goes, As of ubercart 6.x-2.0-rc2, the recurring billing functionality which was previously in core, is now a contrib module. There have been great strides made in creating new orders for each recurring billing, and I have successfully tied this into uc_cim 6.x in a development environment.

I must stress the importance of the uc_cim module getting a proper project page on d.o so we can have a proper collaboration space. We need an issue tracker outside of a single comment thread on this page. I believe the uc_cim module is a great asset for ubercart 6.x, and it needs to be more well known, and a proper project page is the only way to do so.

I have attached my whole uc_cim.module file as well as a patch against the version in comment #21.