Interesting whitepapers about deploying 802.11g and 802.11a networks:

http://www.proxim.com/learn/library/whitepapers/maximizing80211ginvestment.pdf – Mostly marketing, and some very questionable math, but it does help with understanding why 802.11g isn’t really 54Mbps.

http://www.aws-consulting.com/ResonextV1.2.pdf – Good whitepaper about 802.11a’s applications and also problems with mixed-mode deployment and mitigation.

http://www.redbooks.ibm.com/redbooks/pdfs/sg244466.pdf – Old IBM Redbook from 1996. Some marketing flack, but great, detailed content about environmental factors and real-world obstacles and problems with deploying wireless networks.