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I have the Canon EF-S 17-55mm f/2.8 IS for my 40D and recommend it without hesitation. Though it is pricey you do get what you pay for and if your future plans include a 7D then you will find that you want the best glass you can afford to go with the camera.
I also do own the Canon 10-22 mm lens but find that I do not use it much (I do consider it a good lens however). For landscape I find myself now relying on stitching multiple images to give me higher resolution captures and therefore potential for larger sized prints.
So you could instead use a lens such as the 17-55 f/2.8 and invest instead on some stitching software (PTGUI is what I use) or rely on what your image editing software provides, and get the benefit of wider field of view that way. But stitching does add extra steps to the whole process, has other issues you need to be prepared to deal with (such as moving objects in the scene) and if your landscape work includes foreground objects as well as distant objects, then parallex may be problematic unless you invest in a special panoramic tripod head.
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