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Great question. It's starting to gain a more mainstream following. Here are a few resources:

* https://github.com/celluloid/celluloid

* https://github.com/mperham/sidekiq (built on Celluloid)

* http://tenderlovemaking.com/2012/06/18/removing-config-threa...

I use threading in MRI ruby quite often… maybe I'm the odd man out here.

Threading in MRI is still entirely appropriate for juggling IO. So that makes two of us.

I guess I jumped to quickly to the conclusion that more work would be done in Ruby. I suppose it works for IO. I like non-blocking libraries like em-http-request and event machine for these things.

If I wanted to do concurrent programs, I usually chose C :)

I use it with YARV all the time (usually with the "parallel" gem) to get a Nx speedup on easily parallelisable operations like processing a set of input files, sending HTTP requests to APIs using threadsafe cURL handles, and so on.

Another decent place to find out more about multi-threaded ruby or to post info about it is http://ruby.io/

Don't forget Rubinius! No GIL neither.

Rubinius 2 when it comes out.

I use it quite a bit, across all 4 major interpreters. Not used Hamster yet, though.