I have an older Mac Book Pro running Snow Leopard. When I try to transfer large files over my lan, let's say 500MB +, often it will start transferring and then the connection will just drop... *the wireless icon in the menu bar goes gray *if I try to reselect my router, I'm prompted for my password. *If I turn wireless off, and then back on, the connection reconnects with no prompts, but I have to try again with the file transfer. As I said, this seems to be just with large files over my LAN from other Macs or Windows...I couldn't really say if I've had issues with files from the Internet that I can attribute to this, and not to wider network issues. This has happened with 2 different routers, the Apple Store folks the time I asked about it thought it might be "corrupted wireless preferences" and as it seemed to stop after a reimage, I assumed they were right...though it soon started happening again. It's been a pain, but never worth too much time to try to resolve. If I need to transfer big files, I hook up to the cable. HOWEVER, yesterday's announcement that new MBP's having no ethernet has left me wondering: a) If the problem I have common? Do other Mac Book (plain/Air/Pro) users run into this? b) (as long as I'm here) has anyone any thoughts on resolving this problem?