I rarely sync my iPhone because the laptop I'd used to set up my iTunes with is a 6 year old POS(and I don't mean cash register.) It takes several minutes to launch iTunes and up to 2 hours to sync(excluding the time to download any updates.) Now, I only sync when there's a major update to iOS and even then, it's an all night process. I'd transfer my stuff to my new MacBook but I don't have a flash drive big enough to handle everything. More than likely when Lion comes out(and I get it because I want the bugs worked out before I take the plunge) I'll migrate everything, but since Apple no longer does that when you get a new Mac, it hasn't been a priority for me.
If both laptops have wireless, why not use that? Or grab yourself a cat5 cable from somewhere and link them directly? You don't need to sneakernet between laptops unless something is broken in one.
