Some/Most 802.11b hardware and software only allows
WEP as security. 802.11g comes with
WPA which is considered more secure.
In some cases, the lack of WPA upgrades for existing 802.11b products is a business decision, in others it is technical. So if you want to be sure about better security, the best way is to start at 802.11g.
Note that many Palm devices still are shipping with only 802.11b.
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