Forum Moderators: open
Findnothing
decreased
nonoodle
All didn't work for me, but others may have a different opinion.
epilot
brainfox
mygeek
roar
searchfeed
7search
goclick
are marginal to ok. The narrower the niche, the better the results. You also have to consider the traffic partners. The three that I stated to stay away from partner with anyone who has a site. Just keep that in mind.
CompWorld
Many of the publishers on the networks of some 2nd/3rd tier will deliver decent traffic but there will also be rogues.
To consider (depending on sector) :
Business.com
Looksmart Looklistings
FindWhat
Kanoodle
Enhance-Interactive (fomerly ah-ha)
Lycos Insite
Outside of those we've not had a positive experience. In some cases the rewards were not worth the effort (poor traffic quality in some cases, no traffic in others), they didn't work for certain sectors due to the demographics of the desired end-user.
The other thing to consider is the expatriated potential US clients. That brings into play the likes of Espotting, Mirago, Webfinder, Overture UK.
There are plenty of searches with a US focus where the searcher happens to be in the UK or Europe on business but is looking for fulfilment in the US.
Certainly not to be overlooked.
I'd say I've had a positive experience in some industries with all the companies above epilot. Of course in some industries I have bad experiences with all or some of these companies (including google and overture)
Google AdWords
Overture US & UK
Espotting
FindWhat
That's all. I've got friends who have used the smaller ones like ah-ha, and most were what looked like cheat clicks. I'm not saying all the clicks are like that, but of the 6 people I know that have used smaller engines, 2 of them demanded refunds and the rest never used them again. Plus, do you even know people who use the smaller engines? Just think to yourself when determining which PPC engines to use "Who do I know that uses these engines?". Should solve it fairly quickly. Goodluck.