Joshua Allen is right about tablets, I suspect (although I've yet to play with one). My closest previous encounter was with the Clio - quite a practical design, CE, and good handwriting recognition. But I hope he's wrong to say "this third wave is about digital entertainment" (via Steve Jobs, in part), when digital entertainment mostly means broadcast. Being a consumer of broadcast entertainment is a pretty mind-numbing way to pass your time, mostly.
New hardware means we carry connected computing devices around more - of course tablets will be entertainment devices rather than just the nerdy grey box humming in the corner. But a connected tablet can have a really different social dimension from your PC, Playstation or TV. It'll be great for small-scale social diversions - old-fashioned entertainment - in a way that goes far beyond nerdy "multiplayer gaming". Storytelling, puppetry, theatre - home-made entertainment. Digital? Of course. But massively decentralised too.