Smart-phone weather station
Add-on feature for any smart-phone to read and record wether data. From temperature, humidity, barometer, and wind speed ... to even maybe a point-and-read thermometer. Simply plug into your phone and gather more accurate data then any weather station can offer.
Include a simple user-friendly app that pools all of the data into useable information for anyone to access. This could someday make weather stations obsolete with millions of readings being recorded.