This is precisely my reason for wanting to use this method. I don't want my personal machine to be on the company VPN. I realize that VPN connections can be setup to use split tunneling so that corporate traffic is routed through the VPN and all other traffic is routed through the ISP's gateways, but from a security and privacy standpoint I'd rather have the machine sandboxed inside a VM that is only used for telework purposes.
I'm currently using a Windows XP VM running on Virtualbox for all my remote connections. But since we have Windows 7 desktops available through VMware View (and will soon be rolling out thin clients across our offices), I thought it would be a good idea to start researching a way to access my virtual desktop from home.
I hope that eventually my employer will implement a Security Server, but in the mean time this information has been very helpful.