Generally what you want to do to get a table as part of a form is to declare a theme function that you then assign as '#theme' => 'function_name', where the theme function is theme_function_name.
This used to confuse the heck out of me, and then I went in and read through the code on the admin/content/node page, which is a pretty good example of how to display a form in a table, I think. -- John Fiala www.jcfiala.net
