Microsoft released yesterday the beta version of the Windows Phone 7 development tools, which was up until now in CTP. You can download it from here. It installs Visual Studio 2010 Express, Silverlight and XNA 4.0 for Windows Phone 7, Windows Phone 7 emulator and Expression Blend 4 beta. Yep, Expression Blend now installs with the beta version and you don’t have to install it separately which is nice. The beta version breaks some of the namespaces and classes from the previous April refresh CTP release. The details about the changes can be found in the release notes here. And finally here is a post explaining how to migrate your app from the CTP to the beta release. You’ll also find two new developer tools with the new installation, Windows Phone Developer Registration and XAP deployment tool. If you’re lucky enough to get your hands on a WP7 developer device you can use this tool to unlock the device for side loading and testing your apps. XAP deployment tool allows you to directly deploy a .xap file to the emulator or a real device. You can find these tools in Start -> Programs -> Windows Phone Developer Tools
Update
Just a slight annoyance while installing the beta release. I uninstalled the CTP and then tried to install the beta and it threw an error saying ".NET Framework 4.0 multi-targeting pack is installed, uninstall it to continue", so I uninstalled it and ran the setup again, guess what it installed first, yep, .NET Framework 4.0 multi-targeting pack.