hyper-v

TFS 2010 Fresh Install - on virtual or physical machines?

Hi, I'm planning on installing TFS 2010 as a fresh install. I'm thinking that I'll do a dual-server deployment to start. For the DB tier, I'll most likely go with physical. For the App tier, is there any reason not to go with a virtual machine? Thanks, --Ed P.S. does anyone know why using the TFS2010 Install Guide chm (TFSInstall-RT...