I've always felt that hand-shaking, particularly among business contacts, had a degree of power play to it. You step into each other's personal space and measure each other's masculinity through grip strength and dexterity, and judge if they're higher or lower than you on some testosteroney social ladder. It makes people feel excluded if they're physically weak, either through disability, age, gender, race or just generally. I won't be sorry to see it go. Among my friends (who are pretty much all geeks of some sort, and come in all shapes and sizes), non-physical greetings have been the norm for years. A wave, a Vulcan salute, a nod, something like that. The same way I don't feel the need to wear an expensive suit and carry a gold-embossed business card, I don't feel the need to physically touch somebody as part of greeting them.