Apps for 3G iPad only

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When Apple's eBook Store opens next month iPad owners will have a lot of categories to browse. Clues derived from Busted Loop's App Store data indicate that eBooks will be divided into more than 150 sub-categories. This robust classification scheme is quite different than that of the App Store, which has only 19 sub-categories for games.

Apple eBook sub-categories will be organized within 20 to 30 top-level groupings. That's similar to the top-level organization of Apps in the App Store. It's also about the same number of categories that there are for Audiobooks. In fact, a few of the new eBook categories are identical to categories found in Audiobooks. Most, however, have been enhanced and expanded. For example, Audiobooks has a category for "Business", whereas eBooks will have "Business & Finance".

Many of the eBook sub-categories are very specific, for example:

• "Manga" in "Comics & Graphic Novels"
• "Special Ingredients" in "Cookbooks"
• "Etiquette" in "Reference"

There are also two separate sections for "Erotica"; one in "Fiction & Literature" and another in "Romance". It's unclear whether these sections will offer different types of Erotica, or will just be separate paths to browse the same material.

The eBook category for "Sports and Outdoors" has the most sub-categories, owing to separate classifications for 15 different sports (including "Mountaineering"). Other categories with extensive sub-categorization are "Fiction & Literature" (13), "Reference" (12), and "History" (11). The "Computers & Internet" category is also among the most segmented with 9 sub-categories including "Digital Media", "Network", and "Programming".

In the run-up to the iPad release in April many Apps are being certified as iPad compatible. Right now just over 10% of all Apps now this designation. "iPad WiFi" and "iPad 3G" are flagged separately, but in almost every case the Apps are compatible with both.. A small subset of Apps (around 50) are compatible only with the 3G version, and they all rely on GPS functionality.