HTML vs. WML
I think the point of that "new-fangled thing" called WML was for developing websites suitable for mobiles, wasn't it? I mean, small pages, quick, right to the spot, and viewable from a 5" (or less) display. My mobile banking site is an example: I can check my balance in 1 minute, tops. (Well 2 minutes b/c I'm stuck with 9.6kbps CSD)
Why would anyone want to watch a FULL webpage on a screen that small??? I mean, not even taking in mind it would take ages to download, even using EDGE.
So I'd go for .mobi sites, that actually *are* mobile sites (wml/hdml). Not those heavyweight HTML sites...