Channel 4 and its free 'Catch-up' feature

I think this must be relatively new on Channel 4 (I don't remember it being mentioned before I left for Spain in January), but I saw it referred to between programmes a couple of days back and this struck a chord when there was a 'plug' later for next week's episode of Brothers and Sisters, to which I became addicted when the last series was run last year on E4. That 'plug' made me realise I had missed the episode from the night before, but not to worry - I was able the watch the whole programme on my PC in 'full screen' mode and enjoyed it, even more so because it was without the ad-breaks. In fact, being able to watch Channnel4 programmes whenever I want, for upto 7 days, makes this a viable alternative to recording programmes on my DVR, even if the picture quality isn't quite so good.