I picked up a pair of Yamaha computer speakers on closeout from Buy.com (http://www.buy.com/retail/product.asp?sku=10221973&dcaid=1688) for only $14. Unfortunately, they are now out of stock...

They turn an iPod into a great little portable system. Right now, I have them set up in my bedroom with the sub behind my headboard and the satellites on either nightstand. Makes for great late night or early morning listening!