Google Scholar is probably the most useful tool on the web today for academics. However, there’s no API for it, and seems to add little to no features with time. I don’t think Google is going to give it the Axe any time soon, but … I can’t imagine ads getting clicked on scholar pages. And Google is a for-profit, so one never knows. In any case, it would not hurt to show Google that we care, and there’s one simple thing to do. If you want to support the creation of the API, you could drop by the google API forums and express your interest.