Curious to know how developer salaries changed at the time. Looking for a reference point for if something similar was to happen again now.
From what I remember happening to coworkers & classmates, though: it was more a crash of employment than of salaries. Basically, the dot-com boom allowed a lot of people who lacked all the fundamentals to become highly-paid tech workers in this VC-fueled machine. When the VC funding dried up, their employers disappeared, they all got laid off, and many people exited tech altogether. I know a number of people who graduated 99/00, and their resume shows 1-2 years at a dot-com, followed by a 3-4 years stretch of temp jobs, usually followed by grad school or a switch into some totally unrelated profession. Their salary never really recovered, because they entered a field that paid much less than the one they exited.
Most people I know who had 5-10 years of experience, a solid track record, and really enjoyed programming for its own sake did fine - in many cases, better than they did before the bubble. Think about it: if you were laid off from a dot-com in 2002 but lucky enough to get hoovered up by Google when they were the only ones hiring, you are almost certainly retired now and probably have a good-size family foundation to give away money. Similarly, I knew one other engineer that got laid off from the dot-com where I worked, ended up doing high-throughput transaction processing for an enterprise storage startup, and made a few million on stock options when they were acquired. The really top-end programmers who had the courage to persist when the industry was cratering - think of Markus Frind of PlentyOfFish, or Joshua Schacter of del.icio.us, or Evan Williams of Blogger, or the YouTube guys - ended up doing really well, and in several cases are now billionaires.
Basically, busts exacerbate inequality. Love what you do, keep doing it, and find out how you can apply it so that other people genuinely benefit from it, and you end up cleaning up on all the wealth that everybody else is too scared to create. Flit between the hot new thing with just a superficial understanding and you'll probably end up unemployed when it's no longer hot.