This morning’s Observer column…

Colossally inflated valuations are an infallible indicator of a bubble. In the late 1990s, dotcom start-ups with 50 employees and zero profits were briefly valued at more than the market cap of Fortune 500 companies. In 2005, Rupert Murdoch paid $649m for MySpace and eBay paid $2.6bn for Skype, a VoIP [internet telephony] company. Last year, Google forked out $1.65bn for YouTube. Such valuations provide terrific incentives for ambitious geeks because the new web services require less upfront investment than the original dotcoms. What is YouTube, after all, other than some smart software for converting every uploaded video clip into a Flash movie, plus server capacity and bandwidth? Skype adds 150,000 subscribers a day and buys almost no hardware because it uses its subscribers’ computers to do the heavy lifting…