Mii?
My Mii. Unfortunately there's no way to capture a Mii directly from the Wii to a PC (although apparently you can do it with a Mac), so I snapped a photograph of it on the TV. Everyone thinks it looks a lot like me.
Emulating Mii?
There's a website where you can re-create your Mii, and here are the results. The emulation is rather different from the actual Wii Mii generator, though. I suspect that whoever created the emulator was young, and was biased towards styles and looks for younger people - the idea of a full beard was apparently beyond their comprehension (or, perhaps, their technical ability).
I suspect that eventually Nintendo will allow Mii captures or emailing or something - apparently they do plan to do more things with Miis. I have to say, it's mesmerising just to watch them interact in the Mii Plaza. A Sims-like game would be really cool.