The tablet wars are on with Apple clearly winning the battle but they won't win it for too long. Keep in mind Windows is still the number one operating system and Android is starting to take a bite out of apple.
So who's getting into the tablet market? Everyone is the answer. HP is probably going to team up with Microsoft as those 2 companies seem to love each other. Blackberry say they plan to launch their own tablet which will probably work more like an expanded blackberry storm. Asus plans to launch their Eee Pad which they have been very successful in the computer market with their Eee netbooks.
No matter how you look at it these tablet and ipad markets are probably here to stay. The non ipad tablets will become the innovators of this market by allowing multiple features and more cpu, memory and input/output devices. Apple will probably copy the competition after the competition copied apple to begin with.
Expect all companies to sue each other for stealing ideas.
In the meantime I want all of these devices to play with.