[link|http://www.dpreview.com/reviews/compare_post.asp?method=sidebyside&cameras=canon_sd550%2Ccanon_s1is%2Ccanon_s2is%2Cpentax_optio550%2Cpentax_optio555%2Cpentax_optio750z%2Cpanasonic_dmcfz5&show=all|Canon Powershot SD550, Canon Powershot S1is, Canon Powershot S2is, Pentax Optio 550, Pentax Optio 555, Pentax Optio 750z, Panasonic DMC FZ5]

I added the Pentax Optio 555 as it is more available than the 550, these are both either discontined or will be shortly.

Drew look at the differences in the Resolution Chart and the Colour Patches taken by the Powershot S1is and the Optio 550. I see many bad things with both of them. But they are significanly better than many other cameras.