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I'm a sucker for a good title bar on Android devices that has a good clock and weather information. My favorite for tablets is HD Widgets, a set of home screen widgets that displays just what I want.
The clock and weather section is configurable, and in different sizes to only take as much room as you want to give up. The bar resizes automatically when the tablet is rotated.
$1.99 on the Android Market
Honorable mention: Beautiful Widgets