The list of keywords expensive:

Per Click ($)               CPC ($)           Keyword

520.52                         97.44               domains yahoo

418.63                         79.81               domain name yahoo

145.71                         68.91                laser hair removal washington dc

119.63                         66.15                law lemon Wisconsin

135.94                         51.14                hair removal washington dc

493.73                         41.97               domain registration yahoo

262.02                         40.36                benchmark lending

438.23                         38.05                domain yahoo

330.50                         37.86                yahoo web hosting

121.27                         36.59                peritoneal mesothelioma

46.38                           36.55               ca lemon law

81.58                           34.13               best buy gift card

96.87                           10.31               adverse credit remortgage

234.33                         30.98               mesothelioma information

48.68                           29.77               law lemon ohio

54.31                           29.34               att conference call

82.33                           28.78               mesothelioma symptoms

36.88                          28.26               personal injury Solicitor

101.30                         28.23               att go

61.47                           28.03               accident car florida lawyer

159.00                         11.27               google affiliate

Adsense is one of the most common revenue generator for blogs and websites. Usually you can drastically improve your click through rate and overall revenue by ad position wise, by increasing the targeting of contents or by optimizing your ad units directly. Below I will cover the last point, how to optimize your Adsense unit with 8 simple tips:

1. Top three performing ad units: 336 × 280 large rectangle, 300 × 250 inline rectangle and the 160 × 600 wide skyscraper. Consider using the units if possible, but remember that other formats may be more suitable for your website design.
2. The most successful link color is blue. The fact is connected with the roots of the Internet where all major websites used to feature blue links.
3. Apart from the blue link, you can also use the color of links that match the pattern of your website (eg If you use green links make the Adsense links from the same color).
4. As a general rule, mixed (no border, same background) your Adsense units if your website has a bright color scheme and contrast (border, contrasting background) units if you use a dark color scheme
5. If the ad is placed in the content that you should avoid using temporary limits on outside content ad units can use the border to draw attention.
6. If your site have mainly repeat visitors (like a Forum), you can play the background color of your ad units to reduce blindness
7. Consider deleting "Advertise on this site"? message from your unit. This can be done on the control panel in the "My Account, turn off the" Advertiser Sign-Up "? features.

8. Test, test and test. Every unique website so make sure you test with different colors and formats and track results to fine tune your Adsense units.