Right, so there were a few issues here...
1) Package lists aren't being updated for some people. I'm one of them - this is why I got nowhere with the install. http://svn.linuxmce.org/trac.cgi/ticket/615
2) There was some missing stuff related to getting the hulu plugin package - Thom added it, now it works right. sqlCVS update the dce repo to get the changes.
3) I was unable to get the autogenerated scenario to appear on orbiters until I manually sorted them in the web admin several times. This is because UpdateEntArea_Media.cpp assumes that it can just select iOrder numbers without checking what exists in the database. In my case, one iOrder was used twice.
I now have Hulu running. The Orbiter controls are not ready yet - you must use a remote with arrows or a keyboard. Other than that, it looks like it works.