I just wanted to share my experience. I'm working my way through the 70-642 study guide (Server2008R2 Networking) and I'm getting to the section that requires an internet connection to the virtual machine network. I've been fighting with VMware server 2.0 (free version) to get my packets properly routed out the internet interface for days; I installed Virtual Box last night, created a new RRAS server and another client, and I had everything working in less then 30 minutes.
I knew it couldn't be this difficult.

+1 to Virtualbox for letting me move on with my life.