You mean like USB2 cards? None that I've ever found, in terms of ethernet and wireless I've used the Global Village PowerPort Platinum for phone and 10T ethernet and the Wavelan Silver Turbo for wireless.
Oh should mention that newer cards have a slightly different 'key' on one side of the card that prevents them from being fully inserted into the PCMCIA slot so if one doesn't seem to want to go in all the way don't force it....
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PowerBook 5300cs PCMCIA card options...
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