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802.11g is a new standard that is as fast as (54 Mbps, in theory) as 802.11a, but uses the the 2.4 Ghz spectrum (as does 802.11b). That means that 802.11g gear will be able to talk to all the currently existing 802.11b equipment out there (so you will be able to use your Axim online while sipping your double decaf latte with low-fat milk at a Starbuck's "hotspot").
My understanding is also that the US Department of Defense is not all too happy with the 802.11a because use of the 5 Ghz spectrum may interfere with military radar operations. In other words, buying 802.11a may be as "unpatriotic" as buying an SUV these days. If you do go 802.11a, I won't be calling you John Walker Lindh. I can't vouch for others though.
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