EventSentry's service monitoring feature allows you to be notified when a service changes its status, or when a service and/or driver are added or removed.
It's important to understand that Service Monitoring is a System Health item and can be added to any system health package. Health items itself do not actually send notifications, but instead log messages to the Application event log or consolidate information to your database. This is a bit different than filters which monitor the event log and forward events to a notification target (e.g. email). Other Health items include Diskspace Monitoring, Software Monitoring, and Performance Monitoring.