For the admin tools you have to install them from amd64/Setup/admintools.msi. I don't konw why they chose not to include these in the regular installation like R1. Check this for a common and related question on the Edge server tools.
http://www.evangelyze.net/cs/blogs/mike/archive/2009/02/05/ocs-2007-r2-edge-management.aspxI noticed in a deployment last week that after installed Standard Edition there were errors about the Monitoring Agent, which I didn't install. To fix the problem I went ahead and installed it since we were deploying voice anyway. I haven't had a chance to investigate further, but it seems to be a consistent issue. It's also possible that this is documented somewhere and I simply haven't read it. :)
Mike Stacy | Evangelyze Communications | http://www.evangelyze.net/cs/blogs/mike