HP TouchPad (webOS) Available in June Starting at $499? May Be Too Expensive to Compete

The common wisdom is that dominant products eventually are replaced by a better competing product. Wordstar eventually gave way to WordPerfect and Microsoft Word. VisiCalc was replaced by Lotus 1-2-3 which itself was eventually replaced by Microsoft Excel. Nokia, RIM, and Microsoft based smartphones have been surpassed by iPhone and Android phones. There are, however, some apparent exceptions to the rule. Microsoft Word and Excel gained dominance in the mid-1990s and are still at the top of their categories.