I will give my five stars one caveat, because while the card is not difficult to install, opening the computer to do so does require an unusual and specific five-sided Allen-wrench-style tool that is not easy to find (hint: go to a store that repairs cellular phones). I am told that newer computers (mine is a Titanium Powerbook from late 2001) can be opened with a simple small screwdriver, but you'll want to look at the bottom of the computer to see if this will effect you -- do you have or can you get the tools to take that whole panel off? Perhaps an Apple dealer can do this service as well (though the card is billed as installable in the home) but here in Italy I did not have that choice. But even though I was a bit frustrated by this problem, the beauty and utility of the whole Airport technology easily makes up for it, hence the perfect score and the enthusiasm.
Another side note: the Airport works in desktop computers as well as laptops, but I'm not sure what the advantage to using it in a desktop would be, since portability of the Internet connection doesn't seem to be of any value if you can't move the computer. Yes, it would save one cable out of the back of the machine, but that hardly seems worth the price of the card and base station. And it does allow several computers to be connected to one broadband line, but the same thing can be achieved with a splitter and a few feet of extra cable that would cost less than $15. It isn't billed this way, but I really see this as hardware for laptops rather than desktops.
The real glory is being able to carry my iBook all over the house and use it everywhere. Combine that with the great battery usage in the iBook, and I am finally not tied down!
Go Mac, and do it without wires. You won't regret it for a single moment.