If you're in the UK and like nature then you should definitely make sure that you watch the new series of Springwatch on BBC 2.
I'm completely addicted at the moment, and am also loving the encyclopaedic knowledge of new presenter Chris Packham. The random nature related facts that he keeps throwing into every conversation reminds me so much of Stephen Fry on QI!
As someone quite new to bird watching I loved the small segment that Simon King did on tonight's programme on identifying different woodland birds by their song. Fantastic!