I've used Nagios <http://www.nagios.org/> for several years. It does everything I need it to do, and it can easily be configured on a remote shell account to monitor the servers as they would appear for someone outside my own network. It has a good notification system and uptime reporting. There are binary RPMs (by Dag Wieers) available and many official and contributed plugins. Writing your own plugin is quite easy too. There are very few dependancies; I don't recall needing to resolve any missing dependancies when installing the package. This is quite a contrast from some of the PERL-based solutions for which you might spend an afternoon trolling CPAN. :)
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