Stories by Matt Hamblen

Amazon launched two new Kindle e-readers priced at $139 and $189 late Wednesday, with the cheaper version a Wi-Fi-only e-reader and $10 less than the Wi-Fi-only Nook.

Online sales of the Dell Streak wireless tablet, with a five-inch screen that many say makes it look like an Android smartphone, could begin as soon as tomorrow, according to online speculation.

Shortages of Android-based HTC Evo and HTC Droid Incredible smartphones were expected to spur sales of the Motorola Droid X, which first went on sale July 15.

Say all you want about whether Windows Phone 7 (WP7) will succeed, but AT&T continues to back the platform wholeheartedly after endorsing it -- and Microsoft 's mobile efforts -- repeatedly over the last year.

The 5-inch Dell Streak tablet won't go on sale by the end of July, a spokesman said late Tuesday. That announcement came after Dell earlier in the day mistakenly posted an online message on its Web site that customers could return to the site Wednesday to purchase the device.

Sprint Nextel today said that its NextMail voice messaging service is now available on all of the devices the carrier sells.

Barnes & Noble Thursday launched Nook for Android, a version of its free e-reading app for devices running Android 1.6 or higher, which include smartphones such as the Droid X.

Microsoft has officially divulged names of at least five manufacturers for its coming Windows Phone 7 devices, with Asus recently added to a list of four revealed at the company's Worldwide Partner Conference on July 13.

Verizon Wireless and Motorola today said fewer than one-tenth of 1% of the new Droid X <a href="http://www.computerworld.com/s/topic/75/Smartphones">smartphones</a> that have been sold have experienced a "flickering" or "banding" on the display, and that Motorola has resolved the problem.

AT&amp;T Tuesday announced that it's offering three new mobile services, including text messaging and encrypted mobile voice products, aimed at business and government users.

Microsoft officials today described how upcoming Windows Phone 7 smartphones will perform within a network of Windows 7 PCs and Xbox gaming consoles through a new Windows Live cloud platform to make the mobile experience easier and more powerful for workers and consumers.

The Droid X smartphone. The Droid X smartphone ships on Thursday, following an unusual pre-sales publicity campaign designed to entice the savvy tech crowd that might also include some in the iPhone 4 camp as well.

Windows Phone 7 (WP7) is coming later this year and today Microsoft released a beta version of developer tools to enable software makers to build applications and games for WP7 devices.

AT&amp;T on Wednesday announced a service for small- and medium-size businesses that want to use smartphones to accept credit and debit card transactions from customers. The service is based on technology from payment device manufacturer Apriva of Scottsdale, Ariz.

The Samsung Captivate The Samsung Captivate, an Android 2.1 smartphone, will go on sale at AT&amp;T later this year, offering a 4-in. Super AMOLED touchscreen display and a 1 GHz processor that may help make the device a viable competitor to the iPhone.