While many affiliates choose to concentrate their pay per click campaigns around Google you should realize that Google AdWords isn't the only pay per click option available. While there is a lot of visitors to that search engine, it does produce good results and return on investment is good, there is also a world of traffic outside of Google. Often it is less competitive to place ads in alternate search engines take a look at these other pay per click opyions. A the very least start with ALL of the big three below:
The Big Three
Google Adwords - This is the biggest and best volume for traffic quality. Has a great user interface, however is also often the most expensive.
Yahoo Search Marketing - Also very good for targetted high quality traffic. Not as high volume as Google, but still very significant. Don't forget to sign up to Yahoo USA, Yahoo UK and Yahoo AUS individually as you need to sign up to each one separately. Yahoo UK and USA in particular are absolute "musts", while Yahoo AUS is growing and has a solid return on investment per click.
MSN Adcenter - This search engine is growing and has very good conversion rates. The volume of traffic is much lower than Google and is about half that of Yahoo but often comes cheaper with a higher return on investment. It's well worth trying.
The next two Up and Comers:
Looksmart - Often underrated, can produce very good return on investments.
Miva - Up and coming ppc search engine that has been known to produce good results.
Finally five more that are worth trying
7search - A smaller search engine with good quality traffic. Good interface. They claim better ROI than either Google or Yahoo! because of their high quality traffic sources.
Go click - Cheap traffic, with a growing and loyal following. GoClick still lets you start an account with only $10 and bid from 1 cent.
Enhance - A strong emerging ppc search engine that has good solid quality control.
Search123 - One of the first ppc search engines. Cost-effective with good support. Fund with $50 and they'll give you $20 free.
Want More Search engines? Visit The PayPerClick Guru.