This site is an amazing resource for sellers... I haven't seen anything that even comes close to comparing! Auction TNT is an auction management service - but it is more than that. They support sellers with the ability to have audio and video in their listings... for only $1 it is so worth checking out!
Jim Cockrum's ebook, The Silent Sales Machine on eBay, is what inspired and motivated me to start my first membership site supporting eBay sellers. He is amazing and not only knows eBay inside out - he understands internet marketing and teaches how to USE eBay to build a business without being dependent on listing auctions. The My Silent Team site brings together the largest eBay expert team to support sellers... and the bonus pool is amazing!