HP iPods are basically the same thing. It's the same unit, they're both PC and Mac compatible, but HP signed a deal with Apple to brand them under the HP name, so it says Apple + HP on the back. Don't think there are many other differences. Pretty good deal. I think Costco sells them for $269 or $279 if you'd rather get one in store, but be prepared to pay sales tax.
The difference between the Apple iPod and the HP+Apple iPod is that the HP iPod is made for a PC and the Apple iPod is made for both PC/MAC. If you buy an HP iPod and want to use it on a MAC computer, there is a special driver to download and you have to format the iPod to get it to work.
If anybody wants an iPod, let me know, I'll hook you up. I sell them at my work.