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Ruby 1.9 is expected to be released at the end of this year and although it's a moving target, moriq (Kazuhiro Yoshida) is trying to make Rails run on it. Even if you don't care about Rails on 1.9, there's a moral to this story. If you have any sizeable amount of code which might have to run on 1.9, your best allies are:

• defensive programming: get rid of all those warnings now, use "future-proof" variants (like module_eval{ define_method(...){ } } instead of klass.send(:define_method, ...){ ... })*1
• unit tests!

In addition to Rails' base libraries (ActiveRecord, ActionPack, ActiveSupport), moriq has been working on other libs/apps needed for Rails development:

• rake
• rubygems
• sqlite-ruby3/sqlite-ruby

You can find his Rails branch (based on 1.2) at http://dev.moriq.com/svn/local/rails/trunk/ .

moriq has been blogging about his feat from day one (in Japanese), and he's logging the progress of the unit tests as he proceeds. ActionPack is but 1 failure away from green, ActiveRecord 7 and ActiveSupport 6 failures + 6 errors (but several are related to his non-UTC timezone). Rake looks much worse, since it segfaults.