Today's release is the 1855 Valuation Rolls. This reflects the first year that valuation rolls were created, the same year that statutory registration began in Scotland. The website has valuation rolls in 10 year increments from 1855-1925. These provide a nice snapshot of where you ancestors were in between census years. They clarify whether the person listed was owner, occupier or tenant. It lists the proprietor of the property and then gives the yearly rent paid.
To read more about the newest release:
The 1855 valuation rolls are free to search. The images are 2 credits to view.