I enjoy reading other people’s predictions. They offer food for thought sometimes, new ideas, occasionally a good laugh, and sometimes a source you can quote for those occasions when somebody will feel good asking "who says so" when you actually have an answer.
Back in the old days when I was a market researcher, we used to do predictions for larger companies so that our clients, executives in those companies, could blame us when things didn’t turn out. Put a source on the bottom on the chart, then you’re not responsible for being right or wrong.
In that context, thanks to Silicon Valley Blog for The 2008 Predictions Galore, a really good and long list of lists of predictions.