Has Nokia finally figured out the formula for a successful Internet tablet-gadget-thing? We're about to find out, because Nokia just announced that the Maemo-powered Nokia N900 is now on sale in the U.S. and shipping to customers who pre-ordered the device.

Unlike Nokia's earlier efforts such as the N800 and N810, the N900 is roughly the size of a regular smartphone. It also actually makes cellular calls on T-Mobile's 3G network or AT&T's 2G EDGE network, instead of relying on Wi-Fi or WiMAX. The N900 offers the Linux-based, open-source Maemo OS, along with 32GB of internal storage, 3G connectivity, multitasking, and the ability to install third-party apps (commercial, homebrew, or otherwise).

The N900 also features a 3.5-inch touch screen, a full QWERTY keyboard, four customizable home screens, and Adobe Flash 9.4 support within the N900 Web browser.

Look for it in Nokia's flagship Chicago and New York stores for - hold onto your earmuffs - $649 unlocked. It's also available online at www.nokiausa.com and www.amazon.com. And if you grab one, let us know what you think of it in the comments.

Twitter has a problem: A number of users tweet, then lose interest. It needs a way to reengage them in the site. And tonight it’s starting to test one way: Notifications.

The test is currently only rolled out to a “limited” number of users right now, according to this update. But those who have it should notice an indicator similar to what Twitter does to let you know there are new search results on a query (see a capture above and below). There’s another service that does these types of notifications for new messages also: Facebook. Yes, Twitter for once is taking a playbook from its rival rather than the other way around.

When Twitter was still a young service, it used to auto-update with new tweets as they came in, in realtime. That was one of the first features killed off as the service began to explode in size and was having trouble scaling. FriendFeed implemented a similar live-updating stream before the Facebook acquisition, and that seemed to help boost engagement. Twitter currently offers live updating stream with its widgets.

The new, revamped MSN homepage is now live. Updated on Tuesday, November 3rd, this hugely popular internet portal sees 100 hundred million visitors per month who comes to read news, watch videos, and get other local information like events and weather. Yet despite its popularity, the portal has not seen a major overhaul of its design since 2004.

If you’re not a regular visitor to the site, you’ll still be able to tell at a glance that it’s undergone a number of big changes. Nothing has been left untouched – even the butterfly logo has been revamped!The new site opts for a much cleaner look. Gone is the blue background surrounding the white space, replaced by a completely white background instead.

At the top of the site, there’s a Bing search box, followed by topical links underneath taking you to news, entertainment, sports, money, lifestyle, or “more” subsections. On the main page, the lead stories are promoted by large, attention-grabbing images while other news items appear below as links.

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When the team at Twitter Inc. hatched the idea of producing a mobile device dedicated to “tweeting” they contacted Jonathan Kaplan, founder of a gadget company that experienced one of the most successful exits for venture investors in 2009.

The TwitterPeek

Kaplan, who sold Flip camera maker Pure Digital Technologies Inc. to Cisco Systems Inc. for $590 million in stock, told the team the man to talk to was Amol Sarva.

Sarva is the founder of Peek Inc., a company that coincidentally aims to be the Pure Digital of mobile email. The company builds a sleek, simple, affordable gadget that allows people to send or receive email.

The result of the collaboration between Twitter and Peek is a version of the device built exclusively for sending tweets.

Clad in “Twitter blue,” the TwitterPeek allows all the same functionality of a desktop Twitter client - reading tweets, sending tweets, replying, retweeting and direct messaging – only it gives users that access on the go.