I feel the same way as Moose Peterson (http://www.moosenewsblog.com). I don’t understand how many photographers (especially ones that call themselves a pro) manage their workflow, edit their photos and print on their own without a calibrated monitor.
With that said, I use an XRite ColorMunki to calibrate my two monitors and printer (however I typically have Mpix print my work).
I used to use the Colorvision Spyder 3 but the ColorMunki is so much more accurate.
What do you use?