Amazon.com is buying Shelfari, the Seattle social networking startup for book lovers, according to sources with knowledge of the situation. The deal comes about three weeks after Amazon.com acquired Victoria, B.C.-basedAbeBooks, which holds an equity stake in Shelfari's main rival, LibraryThing.

Technology allows access to seemingly limitless power, storage For a business, the electricity that flows from an outlet seems endless. And water will stream out of the tap without worry -- businesses pay only for what they use. But computing power hasn't been so seamless. Data storage hardware can accept only a finite number of bytes. When businesses enter into monthlong server contracts, it take