Read the fine print

$79 for unlimited two day shipping? Sign me up:

Enjoy free second-day shipping on every order or overnight shipping for only $3.99 per item to addresses in the continental United States, and the convenience of 1-Click ordering. Items in multiple-item orders are shipped as soon as they're available—at no extra charge. And you can invite family members living in the your household to share the benefits. As an Amazon Prime member, you won't have to think about shipping charges when you order.

[ Amazon.com ]

But wait, I should read the fine print first, eh?

This program is limited to certain products sold by Amazon.com on www.amazon.com that are shipped to continental United States addresses, excluding Alaska, Hawaii, P.O. boxes, APO/FPO and U.S. territories, possessions and protectorates. Though Two-Day and One-Day shipping benefits do not apply to these excluded addresses, members are entitled to free Standard shipping on eligible items shipped to P.O. boxes in the continental U.S. and APO/FPO addresses with U.S. zip codes. We may exclude products in our discretion, including, for example, oversize or heavy items, items regulated as hazardous materials, and other items with special shipping characteristics. Products are eligible for Prime only if designated on the website. Products sold by third parties, or through third-party areas such as Marketplace, Auctions and/or zShops, are NOT eligible for Prime.

[ Amazon.com: Help / Items Eligible for Amazon Prime ]

So about nothing I order is covered, eh? Only if I ordered dozens upon dozens of books and cds each year would this make any sense. Still seems like a good deal for some, but pas de moi.

Now if they extended this to video games and cheese, it might just be worth it...