dude dont get a dell (sorry if you already have)
I personally would lean towards a Toshiba or an HP/Compaq laptop. I deal with Enterprise level laptops, and Dell have been nothing but trouble, I dont have a 1 client without something wrong with their Dell....
Anyhow, like others before me said, you will get at LEAST an 802.11b wireless card, more than likely an 802.11g card, and all laptops will come with a 10/100 or even a 10/100/1000 ethernet card in it. That is what you will connect to your cable modem.
Now, regarding the cable modem, you have the modem already from your ISP? All you should need then is a wireless router/ap - i might suggest the Linksys WRT54g wireless access point/firewall/router. I think it should run you around $60 for it, but it is has a 4 port switch built in for hardwired computers, and 2 wireless antennas for your wireless access.
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