Your iPad has the capability of connecting to any WiFi signal to get online. This is great, but what if you're in an area that doesn't have a signal? You can always wait for the iPad WiFi+3G to hit stores and buy a month-to-month 3G plan through AT&T, but then you're tethered to AT&T's (sometimes questionable) reception and service. Sprint wants to take over and fill in the gaps with its Overdrive 4G WiFi hotspot (which creates a lightning-fast 3G/4G WiFi signal where available), and in addition, will help you carry it all with a sleek iPad case.
Available at participating Best Buy stores, if you can throw down for the Sprint Overdrive hotspot (which is $399 without a contract), you will get the Sprint iPad folio case for free. There aren't a lot of Best Buys that are getting in on this deal just yet (take a look at the state list here), but maybe if enough people get excited for 4G coverage on a network other than AT&T, they'll expand to more territories.