Amazon wants to draw users to its Appstore for Android via a "Free App of the Day" promotion, in which it's offering a paid app for free each day. The first free app offered: Angry Birds Rio, another spinoff game of the hugely popular original Angry Birds. Amazon also got exclusive distribution right to the new app for Android. As could be expected, this deal pulled in droves of Android users who might have otherwise held off on the new app store, at least at first.

The Amazon Appstore for Android has only been live for two days, but today's free app of the day is another quality download, the popular Texas Hold 'Em game, World Series of Poker: Hold 'em Legend, which retails for $5 on Google's Android Market.

It's unclear whether or not Amazon will be able to continue offering such high-profile software during these free daily app promos, but it's certainly off to a good start.