A Windows program that you can install on a server. It will monitor your event log and email you when errors occur. You can specify strings to ignore to weed out common errors.
This utility works nicely under Windows 7. Step one is to use the "Setup.exe" file, rather than the "Setup.msi" file. There are some issues with the .msi framework/coding under Windows 7 for this file. The second step is to check the box "run this program as administrator" in the security settings for the main .exe file (right-click, properties, compatibility tab, privilege level, "run program as administrator").