no, just turntables and cdj's The I pod things are ok if they have pitch adjustment, but most I have seen do not, so you cant really mix with them.
The super cool thing along those lines I saw last spring, is the pacemaker. Its handheld, about gameboy size and a decent size harddrive, wireless, sound quality is very nice and pretty cheap for what it is. and you can do everything with it: beatmatch, eq, crossfader, fx's ect. I was so impressed when I saw it in action. I got to get one someday.