Vonage narrows loss; Limelight post record revenues; Cybersecurity top concern for fed CIOs

> Vonage CEO: Customer acquisition cost "not acceptable," mobile phone client coming

> Vonage narrows losses, goes negative on subscribers

> Limelight posts record revenue in 2008, narrows loss in Q4

> City Hall Internet, phone service a big headache in Dunwoody

> AT&T network hobbles iPhone

> Cyber defenders to hone skills in virtual world

> Cybersecurity challenges are top concerns for federal CIOs

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