This morning, we migrated ZoomIn from rails 1.2.3 to rails 2.02 . The process was relatively painless. Its running about 10-15% faster than previously rails from the initial testing and it fixed the mysterious comma bug that affected rails routing.
Here’s the guide that we used to migrate – http://www.slashdotdash.net/articles/2007/12/03/rails-2-upgrade-notes
We had a couple other things that we found. First, when upgrading to capistrano 2, you will need to make sure that you use the right namespaces for steps that you have customised for the build recipe. Also, be wary of upgrading to RMagick 2, it requires a newer version of Imagemagick beyond what is default package for debian and ubuntu and RMagick has some compile problems as a result. We reverted to older version of RMagick to solve.
We’re in the process on migrating the rest of ProjectX applications over the next couple of days.