Scobleizer has a brief post on a new service for inserting contextual ads in web video. The company launching the service, Immen.se, calls the ads “walnuts”, which are basically keyword-driven text ads that appear inside a video. I’m not a big fan of most contextual ads; just because I watch a clip of Sunday night’s World Series game doesn’t mean I want to buy a Tigers’ cap or a jar of pine tar. At its worst, contextual advertising ventures beyond annoying into the distasteful; consider the turpentine ads placed next to a recent CNN video on a mother forcing her pregnant daughter to drink turpentine. Ouch, babe.