Roundup: AdMob is finally Google’s, Facebook releases Android SDK, and more

Here’s the latest action:

Google launches its own trading floor — It looks like the search engine has launched a trading floor to keep track of its $26.5 billion in cash and short-term investments, according to BusinessWeek. The move seems to be motivated by the companies desire for higher returns on its money.

Facebook offers Android SDK — Today, in the wake of news that more people are using Android now than the iPhone OS, the social network released a beta version of its software developer kit for Android.

Google’s AdMob buy now official — So, despite hurdles, Google’s acquisition of mobile advertising network AdMob is finally final. More details can be found on the Official Google Blog.

Tesla builds mobile game with SCVNGR — The electric car company is offering a new game built on top of Foursquare competitor SCVNGR’s platform. Game players can earn points by visiting and completing tasks at Tesla showrooms — now open in many major cities in the U.S. and Europe.

Google serves up web’s top 1,000 sites — The search engine is publicizing a list it has made of the top 1,000 most-visited sites on the internet, making it much easier for brands and businesses to find the content they want to advertise with.

Microsoft to slash Zune Streaming Music price — The software giant may be reducing its monthly subscription fees for streaming music via its Zune portable media player, Bloomberg reports.

Retweeting comes to Google Buzz — Google Buzz just got its own version of Twitter’s “Retweet” button. Labeled “Reshare,” this button will let people share content they saw in their friends’ buzz streams via their own stream. It’s about time.

B&N launches Nook app for iPad — Barnes & Noble has just released an application version of its Nook e-reader for Apple’s iPad. It’s available for free starting today in the App Store.

Ener1 finds foothold in China with Wanxiang — Battery maker EnerDel’s parent company, Ener1, has signed an agreement with major Chinese automotive parts supplier Wanxiang in hopes of opening the rapidly growing Chinese auto market to its advanced lithium-ion products.