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It worked out of box for me on rails 3 application of mine.

There is a bug in version 0.2.1, apply the following patch: https://github.com/joshmh/globalize2/issues/#issue/35

uses class_name which isn't available anymore - globalize3 fixes that

Just works for me because @hipertracker wrote a comment (one path) in globalize2 github issues. TKS!
https://github.com/joshmh/globalize2/issues/#issue/35

It works in Rails 3. Instalation is just git clone git://github.com/joshmh/globalize2.git into vendor/plugins. And, instead of using MyModel.create_translation_table! it is better to put the code explicite into migration file. See: http://blog.zabiello.com/2010/07/02/rails3-globalize2 (it's Polish text but you can get the idea).