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Microsoft Windows Phone 7 technical preview: A definitive guide
Welcome back into the smartphone arena Microsoft, it looks like you have a serious challenger entering the ring and I will definitely be purchasing a device as soon as I can. I spent an hour with the Windows Phone 7 team and was then given a Samsung developer phone (looks to be something like the i8910 Omnia HD device) with the latest Windows Phone 7 Technical Preview to use for about 3 weeks.
Source: ZDNet

Windows Phone 7 in-depth preview
It’s been a long road, hasn’t it? Well, in some respects, it hasn’t — in fact, it’s only been about two years since development of Windows Phone 7 as we know it today kicked off — but when you consider that this product will be replacing Windows Mobile 6.5, that puts things in proper perspective.
Source: Engadget

Windows Phone 7 In Depth: A Fresh Start
“What’s this?” a girl at a party asked, as I handed her my phone. She touched a square, and everything flipped away. “It’s Microsoft’s brand new phone. Kind of like a fresh start,” I explained. “Oh. It’s… neat. That’s the most apt way to describe Windows Phone 7, really. It’s a fresh start, and it’s neat.”
Source: Gizmodo

Pre-Review Preview: Windows Phone 7
To make a short story shorter: for the last three days, I’ve been one of but a handful of people carrying around a handset running Microsoft’s unreleased Windows Phone 7 operating system. This specific handset isn’t one that’s ever intended for release, and, while it’s looking pretty close to done, the build running on the handset is by no means finalized.
Source: MobileCrunch

Hands-On with Windows Phone 7
This week, Microsoft is shipping hundreds of prototype Windows Phone devices to developers so that they can more easily create new software solutions that will run its innovative upcoming mobile platform. I’ve got one of those phones, and while it in no way represents what shipping Windows Phones will look like come this holiday season, the underlying software is nearly complete and provides the best-yet look at what we can expect from the final product.
Source: SuperSite for Windows