similar to BugzScout in FogBugz (Score 2, Informative)

This sounds similar to the BugzScout support in FogBugz (www.fogcreek.com), except that there the errors get sent to your own database on your own web site, and are not limited to the last 100. Definitely cool and valuable to track where your application is breaking, and have the ability to report back to customers whether a specific problem is fixed, being worked on, or needs help to track down.