The Tailor's Clapper is made to set seams. Here is a picture of one June Taylor use to sell. Scroll about half way down the page. lots of good pressing tool pics there.
http://thesewingdivas.wordpress.com/category/pressing/
The bacon press is for when you are cooking bacon to
keep the bacon flat. LOL. Now it is probably called a Panini press. An old flat iron is great for clapping too!
The Steady Betty is a portable pressing surface board that keeps the block from stretching when pressed.