What is it about humans that makes us so bad at predicting the future? Behavioral economists have found that, as a rule, we're just not that good at guessing how happy we'll be when we move to a new city, say, or if we win the lottery. And in the stock market, it's no different. Rather than investing in what you think will happen, it seems a wiser strategy to invest according to where the predictions of others will be wrong. Fortunes can be made when conventional wisdom falls through. Yet people like me insist on nattering on about what lies ahead. So, following the example of pundits, like TheStreet.com's Michael Comeau, who have the temerity to revisit predictions made hundreds of trading sessions ago, I'll look back on the trends that I expected to drive tech in 2006 -- and even grade myself on each. Watch for a leader in online video to emerge. Thanks, Googlers. About this time last year I wrote, "The biggest star in online video -- and most likely one of the most sought-after acquisitions of 2006 -- appears to be YouTube." It turned out that the No. 2 video company, Google ( GOOG), bought YouTube but kept its own video site independent. In 2007, it will be interesting to see if the two integrate, or split off into separate directions. Grade: AThere will be more people touting podcasting than listening to podcasts. True enough. A Factiva search for "podcasts" turned up 14,584 stories in 2006, up from 5,106 in 2005. There was certainly a lot of chatter about podcasts, although it seemed to quiet down as the year went on.