I haven't had much of an opportunity to use this website for research, but I wanted to make note of it because you can see the census images for Scotland as compared to just an index of the census records on ancestry.com. The site also has indexes for parish registers, vital records, and wills. Credits can be bought to view search results. Also, the 1911 Scotland Census will be available on this site on the 5th of April.
Link: Scotland's People