Big IPOs that year: Google, DreamWorks Animation, InPhonic, Shopping.com, SalesForce.com, Atheros, PortalPlayer, Shanda.
Of those, Google, DreamWorks Animation, SalesForce.com, and Shanda continue to be successful. Shopping.com was acquired by eBay within a year at a modest premium over the IPO price (15%), and Atheros was acquired by Qualcomm after 7 years, for about 3x the IPO price (also around 15% annual return). PortalPlayer was acquired by Nvidia after 3 years for 20% below the IPO price (and 45% below the first-day closing price). InPhonic went bankrupt after 3 years.
If your goal is to get rich via investment opportunities I would not recommend trying to win the stock option lottery via the employee option pool as the best strategy to achieve that goal.
The cynic in me, would say that people who own stock now don't think it would last and are getting out when it's at it's top.
It's things like Facebook putting 'the hacker way' into their DNA and being able to retain top talent that makes the company worth anything. If you took the facebook source code and all their customers away they'd probably have a pretty good chance of making something else that's quite good. Today anyway, but if tomorrow they can't it'll be because they somehow lost their way and let the MBA's in. Kodak had a great place in the market but they just couldn't successfully adapt
I haven't looked at the price but if I was in the USA I'd probably buy some shares, the google float of $100 seemed outrageous at the time, and unless they get further involved with Microsoft I'm pretty bullish that they'll keep going up