Presentation at Inside Mobile Conference (O'Reilly and 360Conferences) at San Jose, CA on July 27th, 2009. Today is possible to create mobile offline (and installed) applications using web-related technologies (XHTML, CSS, JavaScript, AJAX, Flash) and additional APIs. WRT for Nokia-Symbian, WebUI for Motorola, WebOS for Palm Pre, online/offline Webapps for iPhone 3.0, widgets for BlackBerry, and other mobile widget platforms for Sony Ericsson, Samsung, Nokia S40, Windows Mobile, Opera and Yahoo!. There is also a new hybrid paradigm using the best of the web technologies and a native development, like the PhoneGap project that can be distributed in the AppStore. What can we do using this technology? what are the differences between platforms? Can we distribute them in the Application Stores? What compatibility do we have with web standards? What kind of applications are best-suited for this platforms? How to access location, contacts, accelerometer, SMS, home screen and Internet for each platform? What about security and privacy of my code? Let's see how to create mobile web 2.0 mashups ported to many platforms in a couple of minutes using web knowledge.