By chance this coincides with a webinar I'm (John Kew) doing this Thursday on plugin development, based off a similar talk I did with Gary Russell at SpringOne2GX. You can register for the webinar at: http://www.springsource.com/webinars
We are working furiously towards our 1.8 release for AppInsight 1.1 and vFabric 5.1. We also have a bunch of work going into the next major 2.0 release of Insight. We have a great number of new plugins and features coming. Get ready for some sweet Insighty action!