If you have ancestors who settled in Pittsburgh, Pennsylvania or were transported to Australia, you might be interested in two articles in the July/August 2011 issue of Archaeology.
"Australia's Shackled Pioneers" details the archaeology of the convict era and the importance of this period to modern Australia. A snippet of the article is available here. "Letter from Pittsburgh" describes recent urban archaeological digs in the city that have shed light on the middle class of the 19th century. The entire article is available here.
Neither article mentions Scots, but Australia and Pittsburgh were popular destinations for them. Well, I'm not sure convicts have popular destinations. Anyway, the articles might provide a bit of historic context for your family history or research paper.