but please please please, if you're making a site that is even the least bit elastic, do put in a "<meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0">. if you don't put in a min-scale=1, the iPad renders pages at 1024px wide and then scales them down to 768px, making everything unnecessarily small.

You almost have to. position:fixed on a lot of android devices won't work without it.