No just one adapter per console, the hardware doesn't effect your profile as such. However you will need a Xbox Live Gold Subscription per Gamertag on your console itself.
Computer, modem, router, ethernet cord or wireless adapter, xbox, and a membership.
yes totally
The adapter connects you to Xbox Live but only if you have a wireless network and if you have a Xbox Live subscription.
None, all you need is a router,xbox live gold membership and a wireless adapter
Yes, although the official Microsoft wireless adapter costs $100...
Ethernet cable or Wireless adapter Xbox Live membership (Gold Silver, etc) You can get both of these at any Walmart, Target, GameStop, etc near you.
no, you will not need the wireless adapter infact the new 360 slim has it's very own adapter installed inside the console so there will be no need for a wireless adapter
internet a wired adapter (comes with xbox 360) or wireless adapter (I like wireless) electricity
It allows you to connect to xbox live on a wireless network
There are quite a few places where one can purchase an Xbox Live wireless adapter. Some of the places include: Amazon, eBay, DeepDiscount, and GameStop.
Yes, it is possible to use a laptop as a wireless bridge for xbox live.
It will if you buy the 100 dollar wireless adapter.