dcains
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First, 15mm is really a lot wider than 18mm, although you'd think otherwise. And, the 15-30 lens is also physically a lot larger than the 18-50. The 15-30 also has a rather odd (although not for Sigma) arrangement of the lens hood and cap, which makes buying/using filters more expensive/difficult. Having said that, I enjoyed my 15-30 (on a 10D and then 30D) while I owned it, and it was very sharp, corner to corner, with pretty good color and contrast. They're also available at a pretty good price now, too.
I also had an 18-50 for a short while, and found it to be nothing special, and surely not nearly as good in any way as the Tamron 17-50, which seems a no-brainer choice in that price and focal length range. It's very close in image quality to the Canon 17-55 IS.
To confuse matters even more, how about the Sigma 12-24? That's the lens I ended up keeping, and it's a real favorite of mine. Super-sharp, HSM focusing, same weird hood/cap arrangement, big, but not too heavy, and also reasonably priced. And it's made for a full-frame sensor. 12mm is much wider than 15, once again by more than you'd think, and the 12-24 has very little distortion for such a super-wide lens (as compared to Canon's 10-22 or Sigma's 10-20).
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