A few years ago I studied up on handheld media type style sheets, but then I did some research and quickly discovered that only Opera supports it. Without a means to test on the plethora of mobile devices out there, and without some sort of documentation as to what devices come with what browsers and what those browsers support and what their relative market penetration is, I feel like I'm sailing without a map.

So yeah, it's a lot like trying to follow web standards 10 years ago. The good news is that gives me hope that we'll see a movement to do the research, get the documentation together, and work with the vendors to improve the experiences we can deliver to their users (and our customers).