There never was a dot-com bubble (written in 2010).
The bubble related to technology was and is the result of a systemic sub-priming of innovation arbitrage, venture capital. Hence the more appropriate name for what occurred is a finance bubble.
Sub-priming, no different from what happened in real estate, being the inescapable wrath from investor socialism and collusion, in violation of the most basic free-market principles I should add, and fundamentally incompatible with finding outliers of innovation.
Rinse-and-repeat is the modus operandi until even the unsuspecting greater-fools have had enough.