Is it normal for my derailleur cables to cross over on the down tube?
This is one of those questions that can start arguments between bike mechanics--to cross or not to cross the derailer cables. Crossing appears to be becoming more common on new bikes, if the cables aren't internal, but it's also going to depend upon the bike. Smoother shifting is reported by some from crossed cables. I would talk to the mechanic at your LBS about it. There could be manufacturer recommendations or anecdotal experience driving the decision.