I've been accumulating a ton of links relevant to Windows 7 development, so let's use some of them up:

• Eric Nelson points to his team's list of Windows 7 Resources for Developers. Be sure to check their 7 steps to get your app ready for Windows 7.
• Paul Foster has a taskbar article, and touches on tab previews.
• Greg Duncan points to a managed Ribbon wrapper on Codeplex.
• Delay runs through some of your booting and installing options: installing from a USB key, building a VHD from a real machine, making a machine that doesn't really have a host OS, and adding a second boot option to another VHD (one of my own favourites). Scary but cool.
• Speaking of scary, Ben Armstrong has a giant script that lets you mount that VHD you're not booted to and treat it as a hard drive.
• I don't think I ever linked to this November post by Yochay that talks about Windows 7 support in .NET 4 and WPF 4.