I haven't tried something?
We do this in our store and it works great.
http://blogs.msdn.com/teams_wit_tools/archive/2009/10/19/compatibility-matrix-for-2010-beta-2-team-foundation-server-to-team-explorer-2008-and-2005. aspx
Based on this compatibility matrix, you will be fine.
In addition, connection from Team Explorer 2008 to TFS 2010 Server is possible with an upgrade .