1.9.2 is very nice indeed. 1.9.1 mostly solved my long-running-process memory leak woes, 1.9.2 solves them completely - I can now use Ruby for daemons without a second thought. I find this utterly delightful.
Add to that the cool ~20% speedup over 1.9.1 and this latest version of Ruby is a very exciting and compelling release indeed. I am glad Rails Core is throwing their weight behind it.
Still broken, I guess? This is a show-stopper for ruby-1.9 & rails-2 deployments.