There are two ways you can remotely manager a Hyper-V Server. The first one is free and the second one is a paid upgrade.
1.) Hyper-V Manager can be installed as a download for Windows Vista and Windows 7. I’ve written a How to manage Hyper-V server from Windows 7 article.
2.) System Center Virtual Machine Manager (SCVMM) is so much better then Hyper-V Manager. In my opinion this should not be an add-on. Unfortunately it isn’t. Here’s a link to the SCVMM website.