NagiosQL is a web front end for Nagios 2. We just installed it and it looks really cool. Since the documentation we've seen is mostly in German, we'll try to post as much as we learn here in English.
After getting a blank page at the NagiosQL index page, I searched the web and found the NagiosQL wiki, which linked to a test file for nagiosQL. This file found that we didn't have the php5 mysql extension setup.