Who's On Deck

The value of tech companies waiting to go public has quadrupled - from $1.1 billion in January 2006 to $4.7 billion in January 2007, according to Dealogic. These 6 companies could cash in.

Art.com
Art.com
NICHE: Online art sales

CEO: Michael Heinstein

WHY IT'S HOT: Annual revenue estimated at $100 million after merger with Allposters.com. Backed by Benchmark Capital and Polaris Venture Partners.

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