The ability to share resources between several projects would be very useful. Since working on several projects at once is already supported, the old MSP paradigm of a master project which contains resources and includes other pods as sub-projects could be one way to go. A cleaner approach, I suppose, would be to use a workspace which could include several projects and (one or more) resource files. Of course, this could be more work to implement.
+1 this! There should be some kind of warning that appears if you over-allocate a shared Resource across projects, much like MS Project.
Also, the Resource Usage reports should show usage across projects (if the resources are shared).
Last edit: Jalf 2012-10-10