Thanks for the idea of the html block. I'm going to give that a shot.
I too would like to hide the resources link in the activity block, but keep the other links visible. The reason is we have created a "homepage" on the course page with links in topic 0 that go to the webpage resources. These webpage resources are set to display within the course page frame (object tag).
When you have the resources link showing in the activity block it goes to the resources page where all the resources are visible, but there is not a way to change these links to appear within the course page using the object tag (or if there is I haven't found it and would LOVE to hear how to do it.)
Just through I would give you one take on the rationale for this request...