How I get right-click in Ubuntu 8.04
Ok, not quite, but good enough for now...
I followed the earlier instructions in this thread to get a copy of parallels-tools that worked and tweaked the configuration as per instructions for matching video-resolution, etc.
Then in Ubuntu I turned on "assistive technologies". Now go to the Mouse settings and turn on Simulated Secondary Click under Accessibility. Now I can hold down the left-click to get a right click. Works pretty well actually.