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Mobile Usability - Barbara Ballard
Barbara Ballard is the principal of Little Springs Design, a consultancy focusing on usability and user experience of mobile devices, web sites, techologies, and applications.
Mobile presence management for the rest of us
Corporate users have had it available for a while: presence management for verbal communications.

Now Jaiku is providing it for the rest of us, as long as we have a Nokia Series 60. I can't test it out as neither I nor the majority of my friends have a Nokia phone, but the application provides presence, location, and availability information for users in the phone book.

This is the sort of application that could provide stickiness for a carrier if it were given free to its users. Perhaps we'll see a version written in uiOne or MIDP2. It'll take a while.

Style Guides
UI Design Guidelines for Mobile Web Development Buy Mobile Web User Interface Design book
User Interface Design Guidelines for J2ME MIDP 2.0 Buy MIDP User Interface Design
Technologies
Web: XHTML MP/Basic, WML, HDML, XML, VoiceXML, ECMAScript
Application: J2ME, BREW, Palm, PPC, MPEG-4
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