We deployed our beta application on slicehost virtual server. The slice is 1GB using fedora 7, mysql 5.1, jetty 6.1.6 and resin 3.2. Groovy version 1.5.4 is installed on the slice and we used Grails 1.0.1 for development, but it's not installed on the slice.
The application at this point is minimal, but is scheduled to go live later this month. I can't go into to much detail, but application provides a data service between United Parsel Service and a major customer to schedule shipments of large and small freight.