I come from a Java background, and was recently wowed by a brief intro tutorial on Grails.  So, how about a Groovy on Grails Appliance, with PostgreSQL or Ingres as the RDB?  (Not sure if Oracle's really going to support MySQL).  

But I'd think that maybe it would be pretty easy to add a Grails package to your existing Tomcat appliance.

Any thoughts on either path?

Mark