Hi Rainmaker,
Online Direct marketing is a superior way to test your ads.
Research keywords that relate to the products or services that you have on your site. Then create an adwords campaign using those keywords.
Also, when creating the campaign, you want to always have 2 ADs that are equally served on the Google Engine. Depending on the responses you get, and the data you view from the CTR (click through rate), you will be able to estimate which of the two ads is popular and relavant.
Upon deleting the Ad which was "underperforming" and creating another Ad to compete with you exsisting one, you are constantly playing "beat the control."
By continuously playing the "beat the control" game, you will see your CTR increase. Google rewards Marketer's with high CTR by having you pay less for a certain position.
Depending on your keyword research, if you so happen to stumble over a keyword that your visitors are searching for, and doesn't have too much competition, then there is a chance you will only pay $.05 per click
Now driving traffic to your site is only part of the conversion game. You also need conduct split testing on your Landing page. You may also use multivariate testing. By monitoring the effectiveness of your Copy through split testing, you will find which Copy works better for your targeted audience.
Through tracking your visitors from Google all the way to your optin, sales, or lead generation page, you will have the information to make good decisions on your marketing campaigns.
Hope that helps
Best,
Ritchie