The latest cool site of the moment (and in fact my second so far) is find-a-lake.com.

I spotted this site, when it was recently added to my uktopsites listing. The site does what it says in the url, it allows you to search for lakes, in the UK and abroad. You can search via county and type which brings up a list of lakes available with some brief details, with a link to more in depth info.

There's quite a few lakes listed (and hopefully this will grow in coverage), so if you're into lake fishing, it might be worth a look to see if you can spot a new venue to try out.