I keep running into Nick Sieger in my wiki work. He wrote a couple of very helpful things:
Warbler (replacing Goldspike Rake soon) & ci_reporter mentioned on the JRuby and Continuous Integration page I started in the JRuby wiki today).
My other favorite JRuby guy is Robert Egglestone. He fixed the Rails 2 Goldspike Servlet bug I found Sunday. He has recently updated the Goldspike Roadmap. A release of the Goldspike component is coming this month to follow up on the JRuby 1.1RC1 release the other day.
I love open source and the internet machine.