My new InMotion speakers, made by Altec Lansing, arrived in this morning's mail. These are designed for the iPod and provide superb sound for such a modestly sized package (the contraption folds neatly into the size of a paperback book, making it ideal for travel). Moreover, the speakers recharge the iPod as it sits in the cradle and also provide a port for an auxiliary audio line (for a CD player or anything else you want to plug in). Power is supplied either by plugging into a wall socket or inserting four AA batteries.
The InMotion speakers retail for $149 but I got a set for $99, including free shipping, from Buy.com; that's a steal for such a well-made iPod accessory.