The 802.11g cards and such offer more speed.
Yes to both questions.
I am currently utilizing the internet via a cable modem broadband service. I am considering going wireless with a router capable of 108Mbps. I have a Dell Laptop with an internal Intel Pro 2100 3A wireless adapter. The specs for the adapter indicate a maxium data rate of 11Mbps. Will my current wireless adpater slow my network speed to 11Mbps? If so, can I plug in an external network adapter and utilize the faster routers available today?