To answer a few other questions: 802.11a isn't dead--it's quite popular in many installations where 802.11g ends up having the same problems as 802.11b. 802.11g is just an easier upgrade path from 802.11b. In the longer term, 802.11a's advantages (many more non-overlapping channels, better speed since it doesn't need 802.11b compatibility hacks, "turbo" options on some cards that support up to 108Mbps, and a generally less crowded piece of spectrum) may win out for many applications. 802.11a/b/g devices are the really interesting ones, since they will allow interoperability with all three types of wireless network.

(Disclaimer: I'm a programmer at IOXperts)