Kiosk locations, FAQ and other stuff can be found here:
http://www.kodak.com/eknec/PageQuerier.jhtml?pq-locale=en_US&pq-path=7959You can use the memory card from your camera, a CD, a flash drive, etc. I dump the images from my digital camera to a CD or a flash drive, pop it in the kiosk and follow the onscreen instructions. You can print them all just the way they are (4x6 is the default), or you can choose pictures to enlarge, crop, edit, etc. It's really easy. The kiosks allow you correct common problems like red eye and you can also fix the color, brightness, contrast, etc. You can even add text and/or borders if you want to.
Some locations (like Target) have a do-it-yourself kiosk, but they also have a photo counter where the employee takes your CD and prints every picture for you. It's convenient if you have a lot of photos and you just want some 4x6 prints. Obviously, they won't do any editing or cropping for you. If you have a graphics editing program, like Paint Shop Pro or Adobe Photoshop Elements, you can do your editing before taking them in for printing. (I "fix" a lot of my photos in Paint Shop Pro X2 before I take them to the kiosk.)
About doing it yourself at home ...
I have an Epson V500 photo scanner and an R320 photo printer, so I can print great photos at home. It works well if I only want to print a few, but if I have a lot of photos, it's much easier - and cheaper - to go to the kiosk. :-)