Buscapé is far away from being a startup these days. The founder sold the company a few years ago to Naspers a south african media company.<p>EDIT: not a few months, a few years.
I only knew Smowtion because I use them in a couple of blogs. It's an ad network about one or two orders of magnitude worse in earnings than Adsense, as usual.<p>EDIT: Not their fault, of course. It's as good as it gets, talking about ad networks besides Adsense.