Once again, as with CS 1, installing the plugins fro InDesign to use the Bridge/LiveEdit workflow is not the most intuitive thing. Much like installing them for CS 1, you need to have an InCopy CS 2 installation disc to make it work. As I found out from direct experience, copying the plugins only makes things look somewhat right. The functionality will not be there and everything will go belly up in a very ugly way if you try to use a setup like this.
With InDesign installed (and closed) on the machine, run the InCopy installer and enter your InCopy serial number. You should then get a window that gives you the option of a Complete installation which will install InCopy as well as the plugins (probably not what you want) or the option to just install the InDesign plugins. It is the second choice you want to choose. Let everything run, finish, close the installer, and then fire up InDesign. You should see the option to enter a User under the File menu, which you want to do. As with CS 1, this is completely arbitrary and can be any name you want. If everything else worked out, you should see an InCopy submenu in about the middle of the Edit menu and if you right click or Command+click on a story, you should see an InCopy menu there as well. Happy LiveEditing!