I just recently purchased the Mini-iStereoDock (BB 5502) speaker for my iPod Classic.  In simpler language, it’s a “LEGO” brick that attaches to the bottom of your iPod via the docking connector and functions as a speaker.  It uses the iPod’s battery and doesn’t require its own, and is supposed to work with the iPod Mini, iPod Touch, iPod Nano (1st-3rd generation), iPod (3rd-5th generation), and iPod Classic.

The speaker works just as advertised.  The 3rd and 4th pegs on the bottom row are the volume up and down “buttons”.  That’s all the controls there are.  As you’d expect, the sound coming out doesn’t sound like a Bose, but it’s pretty good for a tiny speaker.  The speaker boasts an Active Bass System, whatever that is, so maybe it helps.

There are occasionally times when I’d like to share something on my iPod without having to pass the earbuds or find a large speaker dock, and this little doodad works great for that.  It supposedly comes in 8 colors.  I got mine at ThinkGeek, which only carries the blue.  If you have a similar need, give one of these a shot.