Neener neener. Discs rule,rims drool!
FYI,I've had to adjust the pads on like 3 or 4 of my disc bikes after I bought them. No idea why the shops didn't do it properly.
As for retrofitting discs,there's 2 websites out there that sell products to mount discs to rim brake forks/frames. Too lazy to check myself,but if you search the forums you shold be able to find them. Also note that most discs won't work with road levers. The Avid BB7 does. Problem Solvers makes a pulley device that mounts in-line between the lever and caliper that takes up the slack. I used their V brake model when I swapped my Fuji's canti's for V's and they worked really well.
I'm rather surprised by my Element myself. If a cross bike has discs it's not legal for most competitions,plus more cross bikes are prolly commuted on than raced anyway,so you'd figure they would have more tire clearance.
A note on the DBX;mine's an '06 and when I got it the front reflector would interfere with the front cross brake lever. When you used the cross lever it would hit the reflector(drop lever worked fine). I complained to Schwinn about the design(just use a reflector that sticks out farther),but didn't hear anything back. Just something to look out for. If you get an '07 and it hits,just ditch the reflector.