If you're not familiar with it, Windows SBS 2008 has it's own Software Development Kit, which allows you to extend the security tab, and the Alert infrastructure. Because of the extensibility of this, our MVPs have started to write their own Alerts, even before the RTM of Windows SBS 2008.
Because they are MVPs and want to share with the community, they have kindly created an SBS Code Plex. A place for the community to write, and share Alert Add-in's. If you have an alert that you wrote and find handy, chances are others will as well. Head on over to download and participate!