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I have both (about to ship my D1 to a buyer though) and before I unrooted it, my D1 ran BB v0.4 at 1GHz.
Running both at 1GHz, the X stays cool while the D1 gets hot
The X comes with 8GB of storage for app memory as well as 512MB of RAM while the D1 only has 256MB for app storage
The browser on the X is much smoother
4.3 inch screen > 3.7 inch screen
The X is faster, smoother, and more responsive
Better battery life on the X
Camera on the X is much better
The X will be able to run Gingerbread
That's all I can think of right now. And that's a 2.1 X compared to an overclocked 2.2 D1. Once the X gets 2.2, there's no telling how much better it'll be.