Is it possible to dual boot Ubuntu and Windows 7 with shared data drives and have everything encrypted? I've read the post here on how to install Ubuntu in a dual boot setup with encryption, but it doesn't mention encrypted shared data drives. I have things like media files I would like to be able to access from both operating systems.
I would suggest not possible or at least not as easy as you would be wanting. Ubuntu uses a specific set of libraries to mange encryption/decryption when logging in/out of the user account. This method would not be available in the Windows OS.
To access an encrypted drive in Windows you would need some tools that replicate how Ubuntu encrypts the data as well as having the key available to do the decryption. Last I saw Windows would not even see a Linux filesystem type let alone be able to read the key from it.