Tabletops are any photographic setup which is made on a tabletop.  No one says how big – or small - the table must be – it’s whatever table YOU can manage.  Just remember that.
Still life images are typically constructed on a table top.
http://dictionary.reference.com/  says the American Heritage Dictionary defines “still life” as:
1. Representation of inanimate objects, such as flowers or fruit, in painting or
     photography.
2. A painting, picture, or photograph of inanimate objects.

The Mentor gives quarterly seminars and workshops, and not just on Still Life photographic work.  After April, 2008 - www.pixure.com/EDU/ will have topics, fees, schedules and times.