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When Apple opened its iTunes App Store in July, the idea of a mass-market Web site that sells downloadable games, tools, and other applications for cell phones was a rarity. Handset owners could buy apps from their carriers or the occasional niche site. But these days, the app store concept is becoming commonplace.

Wikis began as free, open, public spaces for anyone at all to contribute and share their knowledge, expertise, and wisdom. Businesses have begun to recognize, however, the power of the wiki model for accomplishing internal collaborative tasks, like revising HR documents, producing specifications, and communicating across time and space. Call it Wiki 2.0 -- and it's the newest thing in enterprise software.