In short, the answer is no. If you have the first iPad, the iPad 2 is not a significant enough upgrade in terms of hardware to warrant a purchase.
The original iPad will still run iOS 4.3, still be able to comfortably run all the same apps as the iPad 2, and also be able to output to HD televisions with the new cable from Apple.
So what are you paying for? The dual camera's? Not worth the purchase price. Wait until next year for the inevitable iPad 3 which should be a significant upgrade.