several comments on rails2.0 preview and the things that appeared to be broken on payplay.fm after small test

auto_complete that we use on search suggest page is now out of ActionPack.
acts_as_tree and all acts_as_* are also absent - thus if you see messages about missing methods - just install them with script/plugin.

AssertPackager had different signature for compute_public_path that's why image_tag didn't work.