You could argue that 2008-2009 was actually the beginning of the last cycle. Aside from including an economic crash (which usually, but not always, accompanies a shift in the tech cycle), it also included a shift in delivery mechanisms from web to mobile, and a shift in predominant business types from social, content-driven businesses (Web 2.0) to marketplaces and on-demand services.

Before 2001-2003 was 1991-1993, which (aside from the recession) featured intense investor interest in VR, tablet/pen computing, WebTV, etc. That period of uncertainty ended with Netscape's introduction and the rise of the WWW.

There was a mini-shift around 1985-86, with the introduction of Windows and Steve Jobs's ouster from Apple. That changed the paradigm of desktop apps from 8-bit PC apps hand-coded in assembly to more slick GUI apps written in C or Pascal that used OS frameworks. Like the other cycles, it was also accompanied by a lot of hype and malinvestment, but largely in the B2B world: the big buzzwords in 85/86 were AI, 4GLs, and 3D computer graphics.

Finally, the PC revolution started in the mid 70s. This also had a similar period of uncertainty, coupled with a recession - take a look at old magazines from the late 60s and early 70s. But instead of computing, the hot technology areas then were flying cars, supersonic transports, and home appliances. Makes me wonder if the next big thing might be something not computer related at all, perhaps aviation (again), rocketry, or material science.