Mobile Marketer – The news leader in mobile marketing, media and commerce.
Cindy Krum – Mobile marketing evangelist, founder of Rank-Mobile, and author of Mobile Marketing: Finding your customers, no matter where they are.
Mobile Marketing Association – The first global association to drive the growth of mobile marketing and related technologies.
iLoop Mobile – Tweets about measurable mobile marketing.
Matt Parzych – Tweets about useful, effective and innovative communications between businesses and their mobile audience.
MobiAd News – Tweets about mobile advertising and mobile marketing.
AdMob – Official Twitter account of AdMob.
Mashable Mobile – Mobile news, app reviews, information and more at Mashable.com/mobile.
Kim Dushinski – Founder of Mobile Marketing Profits, author of the Mobile Marketing Handbook, co-presenter of the Mobile Presence radio show.
Mobile Marketing Magazine – Tweets from a London-based website devoted to serving the global mobile marketing industry.
Deborah Hall – Good informative tweets from Web2Mobile, a developer of mobile marketing tools and solutions.
MobileCrunch – Official Twitter account of MobileCrunch.
OnlyMobileNews – Twitter feed of the latest mobile technology news.
The Text Works – Passionate about making the benefits of mobile messaging accessible to all organizations. Focused solely on SMS marketing.
Texting Forward – Mobile marketing (especially SMS marketing), mobile service solutions, and more.
If I missed that, in your opinion, should be on this list too, please post about them in the "Comments" below. I would appreciate it highly.