The Speak activity is one of my son's favourite. He can't read, write, or type, so we do this together. There are lots of fun situations, when e.g. he's asking a question, and the laptop answers them. This is sometimes quite puzzling for him, and I need to explain that the computer is not actually understanding what he was saying, but just speaking whatever I type into it.
Gregor knows a couple of English words (we read him childrens books in english sometimes, and also from CDs), and we get some mileage out of switching between English and German, and fooling around.