Turning wireless card on and off

I just got my new laptop and am putting Arch on it of course. It has the Intel 3945 card which is pretty common so I thought I'd use the iwlwifi driver. I followed the Wiki and even perused a couple other laptop wiki entries with the same card to see how they did it but none of them have worked correctly. I think the reason is because the actual card isn't turned on. When I boot into Windows the little wifi light comes on indicating the card is active and I can connect to a wireless network then but when I boot into Arch the light is off. iwconfig wlan0 essid mynetwork and iwconfig wlan0 key ******** both run without error but I don't have an IP address.
The only problem is there's no key combination to turn the card on and off. It's a little button that you slide one way to turn on bluetooth and wireless and the other way to turn it off. The bluetooth light is on in Linux but not the wireless. It's driving me crazy because I can't seem to find anything in the manual about it and the card is set to be turned on by default in the BIOS. What else can I do?

OK, I think I figured it out. I'm now using my wireless card to browse the Internet. I think what was happening was my wired interface (eth0) was conflicting with my wireless interface. Once I brought my wired connection down, I was able to connect with the wireless one.
Maybe someone can simplify the process for me now. I've disabled eth0 in rc.conf but in order to get the wireless up and running I have to bring up wlan0 with ifconfig, use iwconfig to configure the essid and key and then connect through wifi-radar (even though wifi-radar already contains the correct configuration). That means I can't just connect with wifi-radar after boot. I have to run those iwconfig and ifconfig commands first. I considered putting wlan0 as an interface in rc.conf but the Wiki entry I read said not to do that for the 3945 card. So is there any way to streamline this process?
And I guess Linux just doesn't send any power to the little light even though it does for the bluetooth one. That really doesn't boher me but it did throw me for a loop the first time around.

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