Using Pay Per click (PPC) can be a great way to see what keywords are attracting people to your site, you can set up a campaign, an this does not need to cost a lot, that is triggered by a number of keyword, using the stats that are shown in your Google PPC account you can tell

• How many times th Keyword was searched for.
• How many times your ad was clicked on.
• How many of those clicks resulted in a sale or enquiery.

Now that you have this information you can see what keywords are bringing in the best returns on your investment.

Instead of continuing with the pay per click you could concentrate instead on the organic listings for these keywords.