Sites of Interest

For the preeminent PPC king:
Google Adwords.

There are no close seconds, so the queen of PPC doesn't exist. For the PPC princess:
Yahoo sponsored search

If you would like to try a free for all commission only
style of marketing the following links may be useful:

For electronically delivered products and services try:

Clickbank

For deliverable goods try:

Click Junction

Another one that seems to treat clients with a little
more respect than the other two is:

Shareasale

Some people have had good success with such methods although there are significant hurdles.

Please note, we do not profit from any of the above links and they are provided as a benefit for you.