Phil Dykstra has put together some optical wireless supplier info: http://sd.wareonearth.com/~phil/wireless/

Although mostly marketing info and futures:
I found some of the articles pointed to by this page interesting: http://www.convergedigest.com/DWDM/freespace.htm
And this article on 1km 10Gb/s transmission intriguing: http://www.opticsexpress.org/oearchive/pdf/23285.pdf

A supplier survey article: http://www.lightreading.com/document.asp?doc_id=1207&print=true

And some laser safety information: http://www.osha-slc.gov/SLTC/laserhazards/