Adwords/AdCenter has worked for me as well so far. My tips: 1. Use conversion tracking. Dump keywords that don't convert. Try to come up with keyword combos

Adwords/AdCenter has worked for me as well so far. My tips: 1. Use conversion tracking. Dump keywords that don't convert. Try to come up with keyword combos that beat the keywords you currently have. 2. Use negative keywords if needed. 3. Try different ads. Dump ones that don't work and try to come up with ones that can beat those that do. 4. You don't have to be the top bidder to get clicks and conversions. I've done better in terms of conversions and cost/conversion in 5th place than in 1st. 5. In my case, avoiding the "content" network was a great move. My ads only show up in search results, not on parked domains. I refuse to use Yahoo! Search Marketing for the simple reason that they don't let me turn off the so-called content network. What you're doing is direct marketing, so your ad copy in the ad is important as is the copy on the landing/conversion page. Don't be afraid to do A/B testing to see what copy works best and dump the old copy. Write copy that tries to beat the winner and test it.