For the very helpful and friendly volunteer in the Lodge shop on Friday afternoon (sorry, I didn't think to ask you name or look at you badge), the bird call identification websites that we talked about are:
xeno-canto - http://www.xeno-canto.org/europe/all_species.php
HiNT - http://www.birdid.no/index.php
HiNT is the one that I couldn't remember that uses a quiz-based approach to learning bird ID. You can use the training quiz as many times as you like for free and you only need to register if you want your name and score to appear in the results list.
Philip