travelin_cat - 5:25 pm on Aug 31, 2012 (gmt 0)

You're looking for Option E) aren't you?

lucy24, not necessarily. I'm not looking for any "magic", just trying to understand what developers find to be the best way to go. This is truly an emerging area, and my gut feeling is that it is going to be very big, very soon.

So G definitely has the technology to recognise the mobile version of a site and serve up the correct url in the mobile SERPS.

nomis5, they do indeed recognize mobile versions, if you have not yet seen this, you really should: https://developers.google.com/webmasters/smartphone-sites/details

This part stands out:

Annotations for desktop and mobile URLs To help our algorithms understand this configuration on your site, we recommend using the following annotations: On the desktop page, add a special link rel="alternate" tag pointing to the corresponding mobile URL. This helps Googlebot discover the location of your site's mobile pages. On the mobile page, add a link rel="canonical" tag pointing to the corresponding desktop URL.