Agree re. port numbers. We currently generate an RSS feed for links to our dev websites, don't think I'll be able to make it work with Cassini
Also, if you need to test things like ISAPI plugins (a re-writer for example) I'm not sure how that's done on Cassini.
I know at one point I had an issue with Authentication not working as expected on Cassini (built in development server)
I use IIS all the time, it's pretty easy to setup, and you guys are already doing that...
On the "Web" tab of your web projects properties screen, you can specify a static port. For Web Site projects, this is in the standard property window.
The constantly changing port is also rather disconcerting to me. Also, for each web project in your solution it fires up another instance of a Casini server, and each one takes anywhere from 20 to 50 MB of memory.