The Guardian recently published an excellent interactive data visualization of the world's 50 most prominent peaks. The visualization offers a clickable map of the world's most prominent peaks on every continent. Click on a peak to view it in Google Earth (you need the Google Earth browser plug-in). You can compare peaks in terms of actual height and prominence above their immediate surroundings. The visualizations can be embedded into your blog or website. I've embedded a slightly cropped version below. Click here for the full-size visualization.