Depending on your niche, it may be a good deal. However, ROI tends to drop for more popular niches. Make sure you have a site that converts real well.
Another hassle with Overture is you can't get too agro with your keywords because (2001: Space Odyssey theme) many of their relevancy editors are so picky about adult keywords that you'd think they are pushing their own sites. This is what jacked up DMOZ for most webmasters in larger niches.
