I've got my tooltip now pretty much in order expect for one problem. The rounded corner placement on the tooltip. Seems the bottom right corner is going just below the Close text link instead of actual bottom of the box. If you go to this page:
http://www.datatv.com/sw/SW_wp_sampler.html and rollover the 'Selecting a 3D Solution that helps you Design Better Products' text link or icon, you'll see the tooltip (and yes, it's a biggie as the client wanted a lot of content there) and that the br.gif image isn't where it should be.