The following information is from the website:
Catholic Parish Registers comprise records of births and baptisms; marriages; confirmations; deaths and burials; communicants; sick calls; status animarum; converts; first confessions and sent rents. The records cover all Scottish parishes in existence by 1855 – before the introduction of civil registration; the records of the main Catholic cemeteries in Edinburgh and Glasgow and the records of the RC Bishopric of the Forces, which records all sacramental events for British service men and women serving in the armed forces worldwide.
Approximately 700 registers have survived, the earliest dating from 1703, but most records only beginning in the 30 years following the relaxation of legislation against Catholics in the 1790s.
Interestingly, the site also holds Catholic records from St. Joan of Arc, Catterick, and Aldershot, both from garrisons in England.
To view the records, visit www.scotlandspeople.gov.uk . Scotland leads the way - mar as abhaist! A help file is also available at www.scotlandspeople.gov.uk/content/help/index.aspx?r=554&1374
UPDATE: There's coverage of the launch for the records at www.heraldscotland.com/news/home-news/two-centuries-of-scottish-catholic-archives-published-online-1.924381.