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With the launch of the myTouch 3G today, T-Mobile continues its dominance of the fledgling Google smartphone market.

The myTouch 3G is only the second Google Android -run 'gPhone' to ship in the U.S. The first, the G1, has been available from T-Mobile since last fall.

T-Mobile is selling the myTouch 3G for $199.99 with a two-year service contract.

The myTouch 3G— available in black, white and red—is considerably thinner than the G1. The chief reason: unlike the previous Android phone, the new one does not include hard keyboard.

Rather, users must rely on the smartphone's virtual QWERTY to enter text in either portrait or landscape modes; like with the iPhone, the keyboard changes orientations when the user turns the smartphone vertically or horizontally.

Underneath the myTouch 3G's 3.2-inch HVGA display is a trackball for navigation. It ships with a 4GB microSD card.

Additional specs include a GPS receiver, 3.2-megapixel camera, Wi-Fi, Bluetooth and, as per the name of the handset, support for T-Mobile's high-speed broadband cellular-wireless network. T-Mobile's 3G network is currently available in 176 cities nationwide.

The myTouch 3G is considerably more enterprise-friendly out of the box. You See, unlike the G1, the myTouch 3G ships with support for Microsoft Exchange. That will make it easier for IT managers enable the smartphone to send and receive corporate e-mail as well, synchronize calendar and address book data, as well as manage the mYTouch 3G.

According to T-Mobile, the myTouch 3G provides users with the ability to personalize the entire theme of the device with new widgets, icons and wallpapers, which can be added directly on the home screen. Of course, there's also the Android Market, Google's answer to the iPhone app store, which hosts thousands of applications for the smartphone.

T-Mobile has also launched a new application within the Android Market called AppPack, which highlights a sampling of apps for Android phones. At launch, AppPack includes the following free apps: Sherpa, imeem Mobile, WorldTour, Phonebook, FreshFace, and Movies. There is also three T-Mobile applications: My Account, Visual Voicemail and Mobile Backup.

Popular phone features made possible by the partnership of T-Mobile and Google include one-touch access to the Google mobile services including Google Search by voice, Google Maps with Street View, YouTube and Picasa.

You can learn more about the myTouch 3G here.

In related news, T-Mobile plans to launch a new BlackBerry, the Curve 8520, tomorrow, and a new Windows Mobile smartphone model, the HTC Touch Pro2, next week.

This new BlackBerry (see above picture) is full-QWERTY model that will be available in two colors, black and frost. Significantly, the Curve 8520 is the first BlackBerry to come with dedicated media keys. It also features a touch-sensitive trackpad for navigation and access to the BlackBerry App World, RIM's answer to the iPhone App Store. See this post for more on the BlackBerry Curve 8520.

The Touch Pro2 (see above picture), which will come in a mocha finish, runs on Windows Mobile 6.1 Professional with latest edition of HTC's touch-screen interface running on top . It offers a 3.6-inch color display that slides back and tilts up to reveal a full-QWERTY keyboard. It also features built-in GPS and is enabled for Wi-Fi and T-Mobile's 3G network. See this poston for more on this smartphone.