Forget all that iPhone 5 talk that has been dominating the mobile device news for the last couple of days – today is an Android day.

That’s because Google and Best Buy have announced a special promotion for the Nexus S smartphone. Today, at any Best Buy store, you can get the phone for free with a 2 year contract.

Best Buy Mobile today revealed an exclusive one-day sale on Nexus S from Google phones valid on all carriers who support the device – AT&T, Sprint and T-Mobile. Customers can receive a free Nexus S phone, either as a new phone or an upgrade purchase, with two-year activation at all Best Buy, Best Buy Mobile specialty stores, and online at BestBuy.com/Mobile.

Nexus S is a pure Google experience phone and runs Android 2.3, Gingerbread, the fastest version of Android available, and will be offered free starting tonight at 11:00 p.m. CST, through Aug. 3, at 11:59 p.m. CT.

The Nexus S, which was launched first for T-Mobile and Sprint, debuted on the AT&T network a little over a week ago.

The Nexus S has a 4 inch AMOLED screen and a 1GHz processor that can support 3D. It is also NFC capable and includes both front and rear cameras. It is a definitely a Google phone all the way, with complete Google mobile app integration.

When Google debut the Nexus S, they also unveiled a game to advertise the device. Nexus Contraptions is a fun little Rube Goldberg-based game that will seriously ruin your productivity. Trust me, you’ve been warned.