Hi, I haven't posted for some time, but I thought I'd join this thread as both a serial webmaster and EU law scholar.
markd is right as from the latest ICO guidance the UK probably won't try to enforce it. I have put a revised terms and conditions on my selivcel.co.uk website which complies with this and the EU law. I use one of the WordPress plugins which won't go away unless someone agrees to the cookies!
My main concern with this law is how difficult it will be to collect stats. As it stands, unless one scrapes the serverlog to find someone with the same data accessing the site now as before, it will be problematic - from the non-UK EU user side of things. But equally, it could be a good thing, as cookies are tied to browsers and not users, who have many different devices and browsers making them somewhat redundant for marketing anyway. I have several browsers running at a time as we all probably do - all with Facebook logged in!
What would people think, if as nonstop alludes to, companies like Amazon and Facebook were to start offing webmasters the chance to piggy-back on their cookies? Facebook Stats, Amazon Stats, etc?
At the HCI2010 conference a licence payer funded researcher at the BBC laughed at me when I said his BBC log-in system would be pointless because many websites would be using Facebook as a log-in - I was proved right.
So could this be the next step, I ask as a wannabe scroll troller!