AT&T and Sony Ericsson announced Android based Xperia X10, available August 15. The Xperia X10 comes with 4-inch touchscreen, 1GHz Snapdragon processor, 8.1 megapixel camera, 8GB on board memory, WiFi, Bluetooth, GPS and microSD card slot. The handset features Sony’s custom user interface with two signature applications Mediascape and Timescape.

Mediascape on the Xperia X10 gathers music, photos, videos and content from your phone’s memory card and online, letting you browse, search, listen and share your media from one unified view. For example, view photos taken on the device as well as your Facebook and Picasa web albums. Or, when listening to a favorite song on your phone, press Sony Ericsson’s infinite button to access related content about the artist pulled from the phone’s memory as well as albums, songs and video content from YouTube and search results from Google.

Timescape is a unique communication application that automatically organizes social interactions in chronological order, leaving users free to concentrate on keeping in touch on-the-go. From Facebook and Twitter updates to photos, emails and text messages, a scrolling menu offers easy viewing and organization of all communications. Additionally, tap the Timescape infinite button to bring up and view all communications from a single person in a single place.

The Sony Ericsson Xperia X10 will be available on AT&T for $149.99 after a two-year service agreement and smartphone data plan, starting August 15.