"Information artist" Jess Bachman has done it again: he's designed a "History of Search" chart that shows how search became a $20 billion business over the past two decades. Above, a small snip. The chart is broken down more or less by company (the defunct and swallowed-up also-rans get a cluster all their own).
Coincidentally, another website published a "history of search" infographic today. I'm partial to Mr. Bachman's myself, but interesting that the two unrelated efforts went up in the same 24 hours.