"In content" meaning a Premium ad placed in the body of my content. They're not contextual and therefore don't interfere with you using Adsense.
I get pretty decent SEO traffic on my blog and i get a few clicks everyday from chitika. I thinks it also interesting to note that I have Chitkika only enabled to those who are visiting my site via search engines. Yet I'm still making some money. I think product reviews tend to do the best as for pages that convert to clicks.
i once used chitika from feb 2008 to june 2008, during that time, chitika worked quite fine for me, i can earn almost $100 per month, but since july 2008 it just went down and down.. and the funniest thing is last time i used it i only earned $1 per month??!! since november 2008, i never used it anymore.. sad..