HJ, I think if they know signs, they often don't bother speaking the word. DS waved 'hi' and 'bye' for absolutely ages before he'd say the words, yet he could make the sounds, as he'd say baba, and similar. If I asked him to say hi or bye, he'd just wave! :)
BP, pleased your DD is on the mend.
DS loves the alphabet, we have various Apps on the iPad, many game ones, cartoons, Thomas the Tank Engine etc, but very often, he'll want to play the Alphabet ones. He points out letters when we are out - signs and posters etc.
I cannot wait to move into our new apartment, I don't feel properly settled here, just feels like I am on holiday, living with the minimal kitchen, haven't unpacked most of our stuff etc. DS is going to think it's Christmas once we unpack all of his toys! He's been playing with a minimum, poor child! :)