I just released <a href="http://rubygems.org/gems/hijacker">hijacker</a>, a gem to spy on your ruby objects and send their activity to different hijacker servers, which can handle it in different ways. Learn more in my blog: http://blog.txustice.me/2010/11/introducing-hijacker-spy-on-your-ruby-objects/
Hijacker - spy on your ruby objects | Heykuki News