Can you DJ with the 606 and use a Ipod and stuff?

Also, what products can you DJ with and the 606 can go nicely with?

I'd say the 606 is the least DJ oriented SP - the 404/303 and now 555 are aimed at that market - hence the DJ connectors round the back. Having said that, theres nothing to stop you using one (I have, with two even). In this role, it can be used like a super-powered Kaoss Pad; rout your decks through the 606 and use the filter + effects to beef up your set. It's a good idea to use a limiter after the outputs though (if the club doesn't have one) as the output can blow speakers with surprising ease.

Dunno what you mean with the Ipod?