Traktor DJ is a new app by Native Instruments, which is a full on DJ app for those who like to travel and don’t want to carry anything but an iPad or iPhone. (Needless to say, most of the pro-DJs to today won’t carry much more than their laptop, the „Serato-box“ and some cables, with ‚em anyway.)
I didn’t test it at a club yet, but I think I will use it for short 1-2 hour sets, birthday parties, etc.
more info: http://www.native-instruments.com/de/products/traktor/dj-software/traktor-dj/
It’s just 17,99 € for the iPad and just 4,49 € for the iPhone. You will be able to auto-sync, set cue-points, loops and apply effects… and go stupid with the freeze mode.