There's a cbeebies app my 3 yr old loves, and she's just got hooked on her 5 yr old cousin's game - barbie "I can be". There's also a Ben and holly game which has great reviews. My littleun is a bit too young for it really, but she likes trying to do stuff. Oh, and she loves youtube. I just subscribed to a few good nursery rhymes channels and she's quickly learned how to access them, skip the adverts and happily sings along with her headset on (totally out of tune, but hilarious).