Hey, excellent book. I have had it a little over week and it is already dog eared, post-it packed, and coffee stained. There is not a section in it that doesn't have something I want to try my hand at some date.
While not mentioning it specifically, your book helped me to decide to pick up a D-Link DWL-2100AP to get started with. I was very disappointed to discover that the new Engenius (Senao) NL-3054 AP3 Aries2 has a fixed antenna and is -- evidently -- not available in the US, not even from Senao US. The D-Link unit, while pitifully low powered, has five modes of operation including an AP client mode which is how I will first deploy it. Moreover it has the critically important removable antenna so I do not have to void my warranty by cracking it open to play with alternate antennas immediately (and higher power transceivers down the road). By an amazing coincidence Pepperidge Farm Pirouettes are on sale at the local canned food store. Since I have never seen them there before, I take am taking it as a sign and have selected a few of the undented cans.
Anyway, with regard to wireless networking I didn't really have a clue as to what any of this stuff meant until I picked up your book and used it as a spring board and bible.
I have long been wanting to teach myself some UNIX by building a FreeBSD network file and print server. After reading hacks #51 thru #61 would like to extend this project to include a radio card, Host AP functions, a Firewall, tunneling, bridging, Mac filtering -- all that stuff-- since it's file and printing service demands will be small. I was wondering if wherever you mention Linux, FreeBSD could be substituted and used with the libraries and (what I assume are) OS commands and set-ups you give?