During the last week, Family Search has added both the 1841 and 1851 Scottish census records to its huge database. The later census will be of particular value to family historians seeking ancestors who departed Ireland in the wake of the Famine.
Searchable by name, the 5.5million transcriptions come from Find My Past and are provided without images and on an individual, rather than household, basis.
These restrictions make heavy weather of a search for a family, but since they're free, we'll have no complaints!
If, having found your ancestor, you want to pay to view and download an image of the relevant census return, go to Scotland's People.