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.

Postini
Postini
NICHE: E-mail security

CEO: Quentin Gallivan

WHY IT'S HOT: Cashed in on the rise of spam. Has more than 36,000 customers around the world and has been profitable since 2004.

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