Hijack: Get A Live IRB Prompt For Any Existing Ruby Process
http://www.rubyinside.com/hijack-get-a-live-irb-prompt-for-any-existing-ruby-process-2232.html

Only requires that gdb be available on the box. No requiring libraries or listening on sockets to get the console. Rad.

Whoah, hot-swapping IRB prompt for running Ruby process.