What are they up to?

I've stuck to the main channels; BBC, ITV and Channel 4 looking at what they have to offer in terms of internet TV at the moment.
The BBC have recently launched iplayer which allows anyone to go online and watch a BBC show (on any BBC channel, including freeview channels) at their leisure. I watched Sense and Sensibility on my laptop yesterday as I missed it on Sunday. A brilliant idea, although the quality is not as good as watching on a TV. Just go to the BBC website bbc.co.uk/iplayer. You can always catch up with the news on BBC, although not on the iplayer which is a shame as accessing their site and navigating around it for news articles isn't always the quickest method.
You can pretty much catch up and watch anything you like on any TV channel website, itv.co.uk and channel4.com. Local news and information is always available on the main terrestrial sites also. It's getting easier and easier for the audience to go online and watch. For local regions, the onslaught of internet TV will open up a range of stations and information that might not have been as readily available which will mean a larger audience for the main channels.
What do the advertisers have to think about now? How will internet TV affect the way commercial stations make their money is just one of the things I will be looking at and also how this affects the online audience.