To add style selection options check
HERE for style chooser code - it will become an option one of these days..
I wrote this style to work with my mobile detect add-on, so teh user never actually gets a choice on my site. The get the sites default if visiting from a PC or the mobile style if visiting from a mobile device.
An update on showing this style to Yahoo. I can confirm my bandwidth has dropped by about 10GB/month by forcing Yahoo spiders to the mobile style