Dell Thunder is running under Android 2.1. This device is expected to arrive on the market sometime in the fourth quarter of the ongoing year, bringing forth an impressive 4.1-inch touchscreen display.

Boasting features as impressive as those included in Lightning, the Dell Thunder comes with a sleek design, a 4.1-inch OLED touchscreen display that boasts a WVGA resolution, and with a custom Dell "Stage" UI on top of Google's mobile operating system. Those who are familiar with HTC's Sense solution will find some similarities with it in Dell's interface. However, the UI is heavily customized, and it is also able to offer enhanced connectivity with social networking sites, it seems. 

Engadget has today posted a document outlining Dell's plans to be one of the first to market with a Windows Phone 7 device, and it's a doozy. The document outlines the specs for the as-yet-to-be-confirmed Dell Lightning, a WP7 smartphone with a 4.1-inch OLED touchscreen display, 9GB of storage (from a strange mix of 1GB internal and an 8GB microSD), a WP7-mandatory 1GHz processor, 512MB of RAM and all the connectivity options you could hope for, including the Wi-Fi 802.11n protocol.

It will also feature something we don't think you'll have seen before, a full QWERTY keyboard under a slider. To be honest, and feel free to disagree, but this keyboard seems like the kind of thing that smartphone lovers will hate, but full points to Dell for trying something new anyway. 

If the documents are legit, and they certainly seem that way, we can expect the Lightning in the second-half of the year, no doubt to coincide with the official WP7 launch.