Shopping at your fingertips is now possible with a mobile platform any place in the world where there is wireless access to the internet. More and more companies make a mobile version of their internet site. In its simplest form all you may need is to make your site mobile friendly.
Related link: W3C Mobile Web Initiative.
2. mobile.site.com or site.mobi or ...
One solution to make your site mobile friendly is of course to use one or more CSS style sheets made seamlessly for different mobile platforms. Other solutions that more and more companies seem to prefer is to make a mobile sub site mobile.site.com with its own markup, content and code with a link on the main site. The file extension .mob is a Top Level Domain (TLD) in the Domain Name System of the internet. I have no information that a mobile version of your site site.mobi is more popular than a "mobile" subsite. So what should we choose when we build a mobile version of our web site?
3. Other recent SitePoint forum threads.
Mobile websiteOne thing that they seem to be conflating is mobile and mobile phone. When I talk about a 'mobile site', it's a site geared to mobile phones, and particularly in terms of the small screen and the difficulty of using such a device. They several times showed iPads suggesting that they count them as mobile devices, whereas the size and resolution of them is closer to that of a desktop than a mobile.