Like most have said, the 17-40 L is a great lens, it won't dissapoint anyone and it's one of the few L lenses that are affordable and well worth the money. The 70-200 L f4 is another well priced L lens... I don't use it enough to justify the cost of the f2.8 version.
Another lens of interest is the Sigma 18-50mm F2.8, I've had one for a couple months now and it's actually staying on the camera more so than the 17-40.... results are similar and the f2.8 was the main reason for trying this lens. Plus it's so compact compared to other 2.8 lenses. Worth considering if 2.8 is important to you.
The 100mm f2.8 macro is a nice lens too, I don't think I pull mine out as often as I should. I really only use it as a macro lens.
And the 50mm f1.8 is hard to pass up for the money. I've used it for several full tank shots. It's cheap, fast and sharp...
The kit 18-55 that came with my camera is sitting in a box somewhere. I found it very soft personally. I was uncertain with the 17-85 IS ef-s, not sure if the ef-s line will have a short or long life, I feel most digital SLRs will be full frame shortly and the need for an ef-s lens could fade out... who knows, I often hear people say it is overpriced, I have never used one though.
Next on my wishlist is the Sigma 14mm f2.8 EX, I hear great things about it from a few friends that have one.
I'm sure you've been here before but just in case you haven't:
http://www.fredmiranda.com/reviews