jRails
jRails is a drop-in jQuery replacement for the Rails Prototype/script.aculo.us helpers. I (Patrick), modified the plugin to work as a gem and to support Ruby 1.9.X. All bugs are probably my fault, thanks to the original author.
Resources
Install
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.script/plugin install ennerchi.googlecode.com/svn/trunk/plugins/jrails
Project Site
Web Site
Group Site