I agree whole-heartedly with the others on the first page, so it's credible by association, I guess.
Search engine regulation. Search engines are really the main portals (more cynically, chokepoints) of the Web. The power wielded by Google, Yahoo!, Overture, and MSN is astounding. If you don't show up on search engines, you might as well not exist. In a world increasingly dependent on the Web, that's a lot of power. One that won't go unnoticed by government types (or lawyers) forever. At some point, someone's going to file a class action suit, or some legislator whose business got lousy rankings is going to say, "Hey! This isn't fair!" I don't know how attempts at regulation will pan out, but it's inevitable the government will try to get involved.