I am sure I am not alone in the pre-sales world in spending a huge amount of time working in Virtual Machines.
Whilst I have not gone as far as booting directly into virtual machines using Windows 7 as most of mine live on USB drives and I hate re-booting my machine I was very interested to pick up on this tool:
VHD Attach is a free utility that allows you to use the context menu to attach and detach virtual drives to your base Windows 7 machine.
From the web site
This is small tool that adds Attach and Detach optionn to contextual (aka right-click) menu of Virtual disk (vhd) files. That enables those operations to be done without trip to Disk Management console. Detach option is available on hard drive contextual menu also.
Now to make it perfect if they could just add the functionality to add it to the boot menu.