Waggener Edstrom has introduced Ripple Effect, which determines the influencers with the most impact on a campaign. The tool gathers data with help from a partnership with PostRank, and can show information such as the speed of engagement, where activity is happening, and for how long. Those who attended the keynote presentation by Microsoft’s Adam Sohn caught a glimpse of the tool.

Docstoc is launching its iPad app today, reports TechCrunch. Docstoc Premium is free and provides access to both business content and millions of library documents that can be searched and saved. This is Docstoc’s first mobile app.

An inventor, Cliff Thier, has created the iKeyboard, an “overlay” that improves upon the iPad’s touchscreen, Mashable reports. The iKeyboard is meant to work like a conventional keyboard, minimizing mistakes without adding bulk to the lightweight tablet.

Buddy Media has acquired Spinback, an analytics tool that gives online retailers measurement info about the impact of digital tools. Ad Age reports that Buddy Media has plans to expand Spinback’s uses beyond retail.  [Our contributor Joe Ciarallo works with Buddy Media.]

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