OReilly's network has published a couple of interesting articles on 802.11b security in the past year, but I don't think we have published them before. The first is
Seven Security Problems of 802.11 Wireless
, covering a broad range of topics. Notice that OpenBSD based solutions can help mitigate some of those risks (ie authpf, IPSec devices, etc). A second article worth looking at is
A Technical Comparison of TTLS and PEAP
, which are two authentication protocols proposed for networks. An interesting overview of the ideas.