The Tailgater has an iPod dock, gets about 12 hours of playtime when fully charged and includes two jacks, so you can plug in microphones or an instrument.
We've used the Tailgater on the beach and at parties as a karaoke machine.
I have plans to buy a bike trailer so I can use the Tailgater as a mobile DJ station. You've got to admit, it would sure beat this guy's rig:
The Tailgater was a great deal at $279.99 when it was first released. Now that it's only $130.30 on Amazon with FREE shipping, you really can't beat it.