Amplitube + iPhone + Speaker Dock?

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So I got to a lot of comic & anime conventions, and I like to play my guitar while at my table. Next year I decided to go with a set-up of my iPhone 3GS with the Amplitube app into a speaker dock.

I was wondering if anyone who does a lot of digital music could RECOMMEND a speaker dock. Not just one with good sound, but good portability too. Battery-powered would be best.