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I have a Toshiba Satellite P205-S7402 laptop, and it supports 802.11b and g at present. I want to use 802.11n as well - can I just swap out the wireless card with a new PCI card?

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Yes, it would upgrade to 802.11n. But with laptops it isn't very easy to switch a PCI card. You could use a USB wireless adapter or a different kind of pluggable solution (PCMCIA or what it is called these days).

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There's always option to get a miniPCI or miniPCIe card with the adapter. – AndrejaKo Jan 17 '12 at 9:23
Most people don't want to open their laptops, the manufacturers don't like it and you will have to say goodbye to your warranty. So a pluggable solution in a usb port would be the easiest ;) – Robert Jan 17 '12 at 9:31
@Robert: In the United States, a manufacturer can't legally void your warranty for this, it's prohibited by the Magnuson-Moss Act. – David Schwartz Jan 17 '12 at 10:01
Don't know if Sudipta Chatterjee lives in the US, doesn't sound like it. – Robert Jan 17 '12 at 10:25
@Robert His profile says he lives in California. – David Schwartz Jan 17 '12 at 10:36
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