When I am looking to hand registering a keyword or product domain, I look at a few things including searches per month on Google, cost per click, number of advertisers and I search on eBays completed listings.

eBay Completed Listings

eBay's completed listings search allows you to see the closed listing for the kewyords you enter. You can then view all of the items selling prices, number of bidders, and how often the items are selling.

This way I can see how popular an item is and how much people are willing to pay for them. It is a great way to look at the market for a product. As an added bonus you can look at the titles and see the keywords people are using to search for the items.

So try it out for yourself all you need is an ebay account and an item to search for, Try it Here

If anyone wants a few product domains this works great for I have a few for sale for a wonderful price that would do great with eBay or Amazon ads.

Related posts:

1. Good Changes Coming At eBay
2. Tools I Use When Buying a Domain Name
3. Success With Godaddy Premium Listings