Finally got a few spare hours to do some hacking on my poor man's NH profiler, and that resulted with Crumbs.
It's an NHibernate profiler for web applications based on Asp.Net, regardless of which framework (Monorail, Asp.Net MVC,...) you prefer to use. It is now much easier to set it up: just drop in the Crumbs.Profiler HttpModule and off you go (actually, you will also need additional CCS stylesheet to make it look nice, and maybe jQuery to make it act nice).
Hopefully, future versions should bring even simpler usage and better functionality.
At the moment code is rather ugly (actually, my first HttpHandler ever) and has no tests at all, but it will change. It is now hosted at Google Code, so feel free to check it out.