Hi Charlie,
I have had great success from this site. It offers Ad Tracking so you can track which ads are generating the most hits. It also offers Auto-Responders, so when someone replies to an ad, the auto-responder will generate letters for you. It's awesome! If you signed up now, it will give you 30 days free! After that it's only $17.95. I've tried a couple of others and they are nowhere near as good as this! They also have affiliate opportunities as well.
Check it out:
http://adtrack.trafficwave.net/t.pl/22844/114384
Let me know what you think. I can tell you about another great Networking Site if you want.
Angela Morrison