The big problem is the OS. The best bet, Android 3.0, is not released yet.
I do like the Lenovo tablet which runs Windows, but you can run Android and take out the screen for a tablet. Sounds like the best of two worlds, but we'll have to see if it really will work well in practice.
Obviously 80 different tablets will not survive on the market. What I wonder, if you're not Samsung or HP, why go into this market at all? At least this early. You don't have a snowball's chance in hell of surviving. It's like a Chihuahua joining a bear fight.
But I guess the "me too" impulse is just damn strong, and companies are desperate to get in on the ground floor of the Next Big Thing.
What is often overlooked is how good a niche market can be. "There can be only one" works best in the movies. Apple was a highly profitable company for twenty years, in a niche market. Find something you do well that others don't, and go in there. Don't try to do what everybody, his dog and his brother are doing already.