I'm working on a project for planning and monitoring accrual patterns in clinical trials. This will eventually lead, I hope, to a grant to support this work. I have some existing R scripts and want to examine the possibility of running those scripts on a web page.
The R FAQ has a section on this.
A nice description of this package appears in the October 2007 issue of R News.
Another possible candidate is CGIwithR. A paper in the Journal of Statistical Software describes this system.
You can find an earlier version of this page on my original website.