Demand for Apple’s next iPad is reaching a fever pitch, with nearly one-third of mobile Web users telling the ad network inMobi that they intend to buy Apple’s third-generation iPad.

Just under 30 percent of respondents said that they intend to buy an iPad 3, and 44 percent of respondents said they wouldn’t consider any other brand of tablet.

Also-rans in the tablet category were the Samsung Galaxy Tab and Amazon’s popular seven-inch Kindle Fire.

Apple, which has already sold 55 million iPads to date, is expected to more than double that number, analysts say. Piper Jaffray analyst Gene Munster expects that Apple will sell 60 million iPads in 2012, USA Today reported. Sterne Agee analyst Shaw Wu was only slightly more conservative in his estimate, predicting 55 million units will be sold in 2012.

With the prediction that Apple will sell its 100 millionth iPad in 2012 came news from the Cupertino, Calif.-based company that the Apple App Store had topped its 25 billionth download. Fitting with Apple’s push in China, the milestone app was purchased by Chunli Fu of Quingdao, China, who downloaded Disney’s physics puzzle game, Where’s My Water.

Apple’s platform has been growing more and more quickly — it hit the 15 billion download mark in July 2011, and the 10 billion mark in January 2011.

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