Agreed. The user should be allowed to select a jQuery source from the Board Setting page in the ACP though. Give the user the option to choose "Local File", Google, Microsoft, Custom, Etc.
I have never had service interruption with using Google's jQuery libraries, but just in case I use an if not function exists statement. If I'm missing a key jQuery function, it loads the local jQuery file. Granted, this is one check that could be eliminated by using a local copy straight away.
I was only saying that we should try and use it as a major part of the framework instead of just including it. Since phpBB3.2 is going to be ported to use jQuery, I think everything will go fine. I'm posting this in 4.0 in hopes of seeing is used from the beginning. I used a modded copy of the phpBB3.0.7-pl1 template engine to build a jQuery MMO, and it was one hell of a nightmare to get running initially. I did manage to streamline everything and still maintain the usage of the template engine, although it's probably not the most efficient setup.
Anyway, thanks for clearing everything up.