There is a known bug in Rails 2.3 that is worth being aware of, count no longer works on anything using named_scope. There are some patches and a fix available in the ticket there and it looks like it will be resolved in the next version... but for now, beware!
also, I'm not sure when but somewhere between rails 2.1 and 2.3 they changed the (partialname)_counter back to it's long lost behaviour of the index starting at 0 (it was changed to 1 awhile ago, and is now back to 0). Please, make up your mind!