I want to create a mobile site and want to target almost all devices from High end (Iphone,android) to low end (nokia's, LG Flip-phones). Which method to choose for dvelopment: 1. Developing 2 sites one built on HTML5 for targeting latest handsets and second built on XHTML MP for supporting old handsets also. 2. Using Mobile boilerplate - developing site on HTML5 and including fallback script (with the help of modernizr) for handsets which does not support certain HTML5 features. Which method seems convenient and sensible.