DJ Ty highlights some of the major feature differences between Native Instruments Traktor Scratch and Rane Serato Scratch Live. There is only $60 difference between Traktor and Scratch Live (Traktor is more).
Here's a classic DJ filter remade. Vermona used to make the Stanton filter from a few years back, but this one has extended range and a few more mods. Check out this overview to see what it's capable of.
In this video DJ tutor shows you how to set and play another file on the same side of the unit. Doing it this way will blend the next tract in with the one that's playing, so as you start the second the first will fade out over the one comming in.