Why is it that economists have so much shared and common data to work with, while we in HCI do not? There is so much raw data out there for economists about the stock market, GNP, GDP, exchange rates, option prices, oil prices, car crashes, sumo wrestling, and so on. Imagine what HCI could be like if we could have that much rich data.
Just off the top of my head, some data sources that I'd love to be able to use:
Google search terms
Orkut and Friendster social network connections
Microsoft Windows crash data, (you know, those popups that appear after a program crashes, asking if you want to send it to MSFT. What programs crash most often? What trends are there over time?)
Yahoo IM, AIM, and MSN Messenger usage trends
ISP usage data (how much traffic is file sharing, web, IM, etc)
Yahoo web page usage trends (What happened when a change was made? What changes have been most popular? Least popular? Which parts of the navigation do people use most, ie nav