sure joaocardoso , i will add it to the list :)

The Building Apps for Windows Phone 8 Jump Start is available for download from below link .

Watch them , try some samples and learn WP8 quickly :)
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Yes , the WP7 should generally work fine on Windows Phone 8 :)

Below are some links which you could get started with Windows Phone development.

Nokia - Windows Phone development Useful Links

Windows Phone Dev Center

Windows Phone 8 Jumpstart Video...