There are many different speaker systems for your iPod on the market. This is I think one of the best for portability. Although how often do you need a speaker when you carry it around. The sit in dock seems a lot like the satelite radio ones for your house. Very good idea so you can transfer music from on the go to at home. No plugging in any device, just a simple slip into the port and you can enjoy your daily playlist at home.

"There is no shortage of speaker systems for the iPod but generally they're fairly heavy and bulky and made for home use, not portable enough for inflicting your iTunes downloads on your trainmates. The PodGear PocketParty changes all that, with a micro-sized speaker that weighs under 2 ounces. Just a single watt of stereo power but that's enough to get a party started on your bus route, or get you pummelled by annoyed passengers. The PocketParty runs on a AA battery for about 10 hours, about the same as the 4G iPods (or so Apple says, I find that's a bit of a stretch).

Also upcoming is the PocketParty Shuffle which will turn the nearly weightless iPod shuffle into "the world's tiniest ghetto blaster". PodGear says the speaker will be so small that the PocketyParty can be connected to the shuffle and still worn comfortably around the neck, pendant-style.

The iPod PocketParty (for 3G and 4G iPods) is available now and the PocketParty Shuffle will be available in April. Looks like only UK retailers are carrying the line at the moment."[via popgadget]