Today’s leak of the LG Optimus 7 has revealed more than the looks of the device and processor speed.
HTC confirmed earlier this year that its Sense UI will be implemented in WP7 in some form but no one have ever seen their implementations.
Link:
Windows Phone 7 mock-up shows what WP7 Sense UI could look like
Microsoft has announced the release of video-based self-paced training material for developers wishing to learn about Windows Phone 7 programming. The training will be led by Rob Miles and Andy Wigley, two MVPs

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For Developers: Free Windows Phone 7 training via Jump Start
Windows Phone 7 Developers are slowly starting to show their works which they have been doing since the announcement of WP7 at MWC.As Microsoft has been keen on getting developers for their platform, they are not only providing them with Windows Phone Developer Tools but also providing them set of guidelines for developing apps for WP7.The important among the guidelines is the User Interface. Apart from regular page & icon based apps as found on Android and iOS,WP7 provides two new way of developing apps. They are · Panoramic Apps · Pivot Based Apps So which one should a developer choose for his app?

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Pivots or Panos ? ?
Leading user interface designers UI Centric today announced details and first images of their upcoming tablet computing interface for Windows 7 devices – codenamed Macallan .

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UI Centric announced tablet user interface for Windows 7, Windows CE 7 OEMs
In an interesting twist, it seems that at least for some types of programs written for Windows Phone 7, multitasking or rather, the simulation of multitasking is completely possible. Over at clr-namespace.com , the author whipped up a stopwatch application which you can start, then “minimize” then return to the app and it appears to have be running the whole time. Of course in reality, it’s not.
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Multitasking in Windows Phone 7: it can be done…kinda
1800PPC has made a list of notifications Windows Phone 7 will support, and since they are all push, they will be instant and great. The notification engine in the upcoming OS is very important in the whole UI feel, experience and look, and the ways the devices will portray these information is quite cool and comes in different ways. The following is a great explanation of how the three different notification functions work: 1

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Windows Phone 7 Notifications
By now, we have read our fill of the early reviews of WP7. As the dust begins to settle, the main focus is shifting away from how surprisingly solid the OS is to suddenly “must have” features. I will try to address them one by one along with other observations

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Thoughts on WP7 Tech previews missing features and other observations
ITCChannel have had a hands-on with a near-final build of Windows Phone 7 in Ukraine, and came away with a generally good impression. He notes the OS (running on the LG Panther ) ran quickly without noticeable delay and liked the user interface, which he called unlike any other, but still easy to to work with and easy to adapt to
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Windows Phone 7 coming to Ukraine in October/November
At WPC 2010, Todd Brix, Microsoft’s senior director in charge of the WP7 marketplace gave an in-depth look at the aforementioned marketplace during the [WP03] Windows Phone 7: what ISV Partners Need to get Ready session.

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More details on apps and the WP7 Marketplace