The wow experience as IT pro and Windows 7 RC having VHD format integrated into the operating system.
The Virtual Hard Disk (VHD) format is a publicly available image format specification that specifies a virtual hard disk encapsulated in a single file, capable of hosting native file systems while supporting standard disk and file operations. They are commonly used as part of the Hyper-V feature of Windows Server 2008 R2, for example. For more information about VHDs, see Additional references. You can use Disk Management to create, attach, and detach virtual hard disks (VHDs). Membership in Backup Operators or Administrators, or equivalent, is the minimum required to complete these procedures.
Create new Virtual Hard Disk and attach it as your local drive.
The virtual hard disk is attached now. Initiate the disk and assign letter & format. I can now encrypt it with Bitlocker and password.
How cool is that? 
No TrueCrypt anymore for me….
I needed to install mutt on my JeOS virtual appliance without having an internet connection because the machine is sitting behind firewall. Mutt is handy in scripts and you can attach your files. The files can be mysql database dumps for example.