I was never entirely sure how seriously the effort was made, but a good resource for some Scots language is:
Wilson, L. (2002). Luath Scots Language Learner: An Introduction to Contemporary Spoken Scots. Edinburgh: Luath Press Limited.
The author makes the point that while "Scots" is a contested term referring to a spectrum of dialect forms -- and not formally recognized as a unique language -- that he looks forward to a day when incomers to regions of Scotland where Scots was spoken historically would take some effort to speak it properly and use it in their interactions with the locals. Presumably the locals would also use it in this ideal universe. 
I recall that people subscribed to Usenet's soc.culture.scottish often posted in some phonetic representation of Scots, as well as the occasional Gaelic.
:ootd:
Dr. Charles A. Hays
The Kilted Perfesser
Laird in Residence, Blathering-at-the-Lectern
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