Hi guys,
I ran a WSO last April (2010) which was overall quite successful. It promoted a product I'd created called WP-Squeezey Pages which is a simple WordPress Sales Page generator.
I started off the WSO at $7 and it moved through several sales processes up to a final price of $19 (less than my sales page) where it sat after selling a few. I stopped bumping the thread and started to focus on other things. In the meantime the product still was getting the occasional sale...