I am listing here some of the links to websites I use a lot. Some are pay per view, like Ancestry, and Scotland’s People but a lot are free.
http://www.scotlandspeople.gov.uk/welcome.aspx (pay per view)
http://www.nas.gov.uk/ (free) National Archives of Scotland
http://britishgenes.blogspot.ca/p/about-chris-paton.html (blog I follow with great links!)
http://www.cornwall-opc-database.org/ (free) Fantastic site for researching Cornish ancestors!
http://www.britishnewspaperarchive.co.uk/search/results?basicsearch=macdonald (pay per view collection of newspapers from all of the UK)
http://www.cyndislist.com/uk/irl (free Cyndi’s list of links for UK and Ireland)
For all of the UK and Ireland
Ancestry.ca , Ancestry.com, Ancestry.co.uk (all pay per view)
http://www.worldvitalrecords.com/ (pay per view)