OK, so this should be on D Announce, and is, but I'll echo it here since it contains components that may be of wider interest.

Incomplete at this point, though there's a working example, but I have to break off now and do some building work. You can find documentation and a zip file (currently it is Windows only, DMD2.026, and Phobos) at http://www.britseyeview.com/dcat/.

It works with Apache2, and uses the AJP13 protocol like Tomcat.