I have just been having a look at the Auction Genius blog and was pointed to This web service for eBayers .... amazing site.
It's called Mpire research .... and they provide you with a stack of information about any item you want to sell ......it is a fantastic research tool ...and like Auction Genius says ...
"How would you like to get this information at any time, for no cost? I think the folks running this site must be nuts, because I have paid for information like this but they're giving it away. I don't understand it, but I am happy to take advantage of their generosity and you should be too. "
You must check it out ...takes 30 seconds to register