As promised earlier here are some references on worked glass mentioned in my earlier email to the list.  There is a lot more happening too.:

Harrison, Rodney
2000
"'Nowadays with glass': regional variation in Aboriginal bottle glass artefacts from western Australia"
Archaeology in Oceania
pp. 34-47

Nathan Wolski and Tom Loy
1999
"On the invisibility of contact: residue analyses on Aboriginal glass artefacts from western Victoria"
The Artefact (Archaeological and Anthropological Society of Victoria)
vol. 22, pp. 65-73

Jim Allen and Rhys Jones 1980
"Oyster Cove: archaeological traces of the last Tasmanians and notes on the criteria for the authentication of flaked glass"
Papers and proceedings of the Royal Soceity of Tasmania
Vol. 114, pp. 225-233

Ruthann Knudson 1979
"Inference and imposition in lithic analysis"
In Brian Hayden (ed), Lithic use-wear analysis, Academic Press, NY, pp. 269-281
[analytical study of cowfacts - good stuff!]