Simply navigate over to my test page, and you should see your cpu (use Activity Monitor) shoot through the roof.
I tried to reduce it as much as possible. If I remove any of the widths, heights, or even the form tag, the problem goes away. Also, if I move the form tag above the table, everything seems OK.
Note that the form did have some content (inputs), but it was not necessary to reproduce the problem.
I hope this is enough information for the Safari team to reproduce. I have trackbacked this to the Surfin Safari Safari 1.1 post.