A Tablet Without the Tablet Would be the Best Tablet.

To the editors and readers at large, I'm wondering why no one makes a tablet to mirror my computer, and that's all it does. I've seen a few clunky looking things, but all lack the polish of a modern tablet. How hard can it be to? Great screen, touch and good battery life. Has anyone seen this or know if one is in the works? What say you? Foolish dreams or the next big thing?