I'm currently investigating the typology of subordination, or to be more precise adverbial subordination, and would like to see the data that the existing analyses, like for instance Cristofaro (2005) Subordination, are based on. Is there already an existing, accessible collection of interlinear glosses or must I keep on hunting down reference-grammars? Primarily examples of non-Indo European languages are of interest.
I know WALS (World Atlas of Linguistic Typolology) www.wals.info has a chapter on the "Order of Adverbial Subordinator and Clause" http://wals.info/feature/
You could use this as a starting point because you know that all 660 languages in this survey cover a good area and genetic spread - and WALS almost always point you to a reference grammar.
Might take some of the grunt-work out of your task!