With Apple’s iPad hitting the market in a matter of days, how big an impact will the computer giant’s entrance into the tablet and eReader business make? A huge one, according to several research firms such as eMarketer, Yankee Group and Credit Suisse. Amazon’s eBook market share is going to shrink, shrink, shrink over the next few years; there will be formidable new competitors coming aboard (hint: a big search engine!); and consumers will be buying eReaders by the bushelful. For all the numbers and how the market shakes out, tune into my New Media Minute this week for a first look at some of the early data on this red hot market. You’ll also learn how the beleaguered magazine and newspaper industries will fare on tablets.