Usability 
The query "Where are you now?" is the most commonly sent SMS message, texted over 600 billion times per year in the US.
A new webapp called Where are you now? (WAYN) from the prolific Dmitry Namiot (Geo Mail, Geo SMS, Mobile Share) automates the asking and answering of that question.
Visiting http://linkstore.ru/wayn/ (on phones with Javascript support) will open the phone's email app with a canned message titled "Where are you now?" and a link to GeoSMS in the Email body. If the recipient is using a phone that supports the HTML5 location provider API such as an Android and Samsung Bada device or an iPhone, when they open the email and click the link they will be taken to a webapp which lets them reply with a text linked to a Google Map showing their location.