Wow, this is great! After starting on 4 new Drupal sites this week, I woke up this morning thinking about RT. I have developed a dozen or so sites using Joomla and mostly RT themes. For various reasons, I have switched nearly all development to Drupal from Joomla, but the biggest thing that I miss from Joomla are the more aesthetic themes, especially those from RT. On my Drupal sites, I mostly use themes from RoopleTheme.com, especially the Tapestry theme. It was the first one where I realized that it WAS possible to do the same layout fine tuning in Drupal that is done with RT for Joomla. I remember talking with Andy briefly at one of the Joomla get togethers and he mentioned that RT was for those who could do the technical parts of Joomla but were challenged with the artistic parts. From my experience with the Drupal community, this is even more the case that they need some good artistic talent. And from my experience, RT is the best.
My Joomla subscription for RT expires in January, but I will sign up again as soon as I see that some Drupal themes are available. Go RT! You deserve world domination in the theming world, as far as I am concerned!

As a relatively novice developer, may I ask some of the reasoning behind moving from Joomla TO Drupal? I've done the opposite, but am just curious as to why you're going the opposite direction.