Where are the best places on the Internet to advertise ebooks for sale

Does anyone have any ideas of where the best places on the Internet are to advertise ebooks for sale (besides a website or blog).

Thanks Craig

 

Haven't you tried this http://www.ebookbay.com/
My friend says it's a great service)))

 

Createspace and Smashwords are the ones that will get you distribution through other sites such as Ipad Barnes and Noble etc. Just be sure to read their requirement for formatting

All of them will do secure downloads for you.