I have had Chitika Minimalls ads on a couple of my sites for a little while now. Adsense is still better, but it is at least another source of revenue.
My main site Tokyo Essentials is a travel site and most of the ads in Chitika are for electronic products. Chitika apparently performs better on product review sites, for example an MP3 player review site.
You can join up here: Apply for Chitika affiliate progam