Since no one has posted here yet, I thought I would jump start things.
What other PPC programs have you all been using? While the core of most advertisers budgets go to Google, Yahoo & MSN, there are tons of smaller engines out there worth advertising on! Are there any that you've found work particularly well? Any that performed poorly?
In my own experience, I've had some great returns with Ask.com. However, I'm not sure what effect the changes from the past month or so are going to have on performance there...