In reply to mike123:
+1 for TrainerRoad. It's the only thing that kept me on the turbo all last winter, and so far this one too. I tried the racing each other type ones, but while they were a novelty for one or two sessions, if you want to use the turbo to get fit, then structured interval training rather than just bashing one out for a half hour / hour are the way forward (so says my wife, fnarr)
As mentioned you need an ant stick for either your laptop, or your iPad/iphone (android not supported) and it costs about £67 per year at today's exchange rate. You then need a speed/cadence sensor for the back wheel to transmit to the App......and a heart rate sensor for the full suite of stats.
Trainerroad can automagically sync with Strava so you get to see the workout easy peasy - it shows nice graphs for speed and heart rate, but if you then sync to garmin connect you can then see the virtual power output.