Web Banner Tip #1 - Nothing beats a good eye-catching punch line
When thinking of the copy for a banner; you need to spend a lot of time in creating a catchy phrase, something that will arouse the interest of the viewers and entice them to click on the banner. The punch line should be a small phrase, just a few words and should be visually appealing (correct usage of colors and fonts).
Web Banner Tip #2 - Good copy
A successful banner has excellent copy. Be sure to spend ample time thinking about what would interest the surfer. Another rule of thumb for good copy is to keep it short and simple. The text should support the banner punch line and should be informative and practical, making the viewer curious or bringing out a smile. Preferably, the copy should end with the same catchy phrase as on your web site unless the banner punch line is the same.
Web Banner Tip #3 - Relevant content in banners - not XXX
Make sure that the pictures displayed in the banner are relevant to the products/services you are offering on your site. A woman in a skimpy bikini would surely attract the attention of male surfers and get a click but, if your site sells electronic goods, the visitor is sure to leave your site before making a purchase. You, thus, end up with high-click thrus and negligible sales.
Web Banner Tip #4 - Including logo and web site URL in banners
If your ad campaign is a brand building exercise, it is advisable to include BOTH the logo and the web site address in the banner. For other types of banners, you might like to include the two, but make sure that they don't dilute the banner punch line or the copy. In such cases, it's best to keep the logo and the URL together either on the right or the left side of the banner. The logo should be made small and the URL can be displayed in a very small font size.
Web Banner Tip #5 - Clichés work!
Statistics show that the best call to action on a web banner is the trite phrase "Click here". Its very presence increases the click-thru rate. The phrase should be displayed long enough (2-3 seconds), preferably in the last frame of an animated banner and can itself be animated - made to blink or change color.
I haven't done a banner ad yet but I have been thinking about trying one.