After installing Mono, to launch a server simply navigate to the directory where your pages resides using a Terminal (command prompt), and type in XSP. This will start a full webserver on port 8080 serving pages from the directory. Now, within seconds, I can quickly make any directory on my laptop accessible over HTTP!
On OSX, the execution simply looks like this:
Pretty:Base Ben$ xsp
Listening on address: 0.0.0.0
Root directory: /Users/Ben/SourceControl/iPhoneWebApp101/iWebKit/Base
Listening on port: 8080 (non-secure)
Hit Return to stop the server.
Great for prototyping and rapid development and while I haven’t tried it, it should work on Windows equally as well.