For log aggregation, Snare is a little old but worth mentioning.
Snare Agent for IIS Servers
I used this old version a long time ago and it worked well by forwarding/sending/replicating IIS logs over a network via syslog.
Today, they have a newer version called Snare Epilog
The code is also open source; you might want to give it a try.
Also, you could use something like ELMAH combined with the RSS/Email features to help notify and alert you of any critical issues.