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Correct. In the current generation there is no use for an 802.11g network card if the objective is improvement in PDA network performance alone. There are other reasons to use one though. Linksys have announced that theirs is coming soon.
Think of standard 10Mb/s Ethernet. It's a shared (non-switched) medium and has to put in mechanisms such as CSMA/CD to ensure that two devices don't transmit at the same time (well, to handle the problem when this DOES occur). Wif is also a shared medium. Pretend that three people are in a room. Only one person can talk at a time, you can't have all three people talking.
This reduces the overall "talk time" in the room.
That's the gist of it. For wifi it's collision avoidance (and a shared medium) that gets you only 5-6Mb/s from the 11Mb/s of "air space".
For the actual specific throughput on the PPC I'd be interested to see some tests on the X30. See if the new processors have increased the throughput at all.
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