The Ion Audio Block Rocker isn't just an iPod dock. It's an amplifier for electric guitars and you can plug pretty much anything else into it as well.
This monstrosity comes with a plug, but it's fully rechargeable. The Block Rocker is sturdy, has a long-lasting battery and is designed for portability. This makes taking the Block Rocker anywhere easy. It has four audio inputs for mics, instruments, CD/MP3 players and the iPod dock. It will turn any gathering into a block party!
It's available on the Ion Audio website for $299.99.