So you have just downloaded Icinga 1.0RC?  Do you need a little help in getting it configured?  Where to start looking for help? …
Here’s a list of resources to assist you in your journey…
http://docs.icinga.com/
http://www.icinga-portal.org/
http://www.monitoringexchange.org/
http://en.irc-monitor.com/Icinga
http://en.irc-monitor.com/Icinga-devel
https://lists.sourceforge.net/lists/listinfo/icinga-users
https://lists.sourceforge.net/lists/listinfo/icinga-devel
Remember that the Icinga-core is backward compatible with Nagios, so you will notice that some of the resources above have shared content.