I've found that really good pictures and a no bs description of an item helps it sell. Pictures are everything.
Also if you have some really big items to sell make sure you have some feedback because some people are skittish about bidding on low feedback sellers.
I sold some audio equipment a while back and i couldn't believe the prices I got. I took great pictures and presented one of the items as being rare (which it truly was) I actually got more $ out of one item than i paid for it two years ago.