I have the same router D-Link DIR 655 coming and here is what I am thinking...
The CD is not for use with Mac, but finally on the net somewhere I found the answer to my question about plugging in and then immediately seeing the wireless connection, which I assume would be the case. Here is what I picture -- corrections welcome, as I will be doing this Monday. (I am way too spoiled using my iMac for a 'router' at home.. LOL it baffles the PC users... they can't find the router!)
Unplug the modem from the power supply.
Connect the Ethernet wire from the router to the modem.
Power up the router by plugging it in.
Power up the modem again by plugging it back in.
Now you should be able to see the wifi connection with a wireless laptop.
Type the default address 192.168.0.1 into FireFox and you should be able to skip to the Wireless configuration screen.
I'm trying to read about it as much as I can before it arrives. The thing I will have to do is this is for a business office and I'm not sure if I can also have another wire plugged from a computer into the modem as well as the router...because it makes me think that setup would two IP addresses. (I did this at home for years until the cable company shut me off... said I had to pay extra for 5 connections I was using with my hub!) So that will be a question for me to try to figure out.
Also, set the router on b and g not n, for the older cards, if you don't have the 'n' protocol.
So other than testing what I can do with my connection which is wired into the wall for another port on the opposite side of the room, I think that is how to start.
My first test will be to see if I can have the router connected on the opposite wall (because it will give a better shot for the signal to travel to the other rooms int he office) and have my laptop plugged in at the desk at the same time. The internet worked both from methods (plugged to the modem and plugged to the wall) but that was only one connection each time as I was alone doing this and only had a laptop with me.
Ideally I want the computer to be at the desk, able to plug into the modem, and the router across the way for the others to use on WiFi.
PS - the documentation was useless.. I am getting this info from reading other sources on the web....also be advised that you just plug in and get a WiFi connection I am going to assume it's 'open' and unless you are in a remote area at home, but in a building of other businesses like I am, you will need to password protect the wireless connection immediately.