I'm having wireless issues with my D600 as well. Odd thing is, I know it works, I've used with with other debian based distros without any real issues (xubuntu, Linux Mint), and with a PClinux base distro.
I'm using Elive 1.0 Gem of the livecd.
The wireless itself it working, sees the SSID. But dhcp doesn't seem to work. To get it at lease pretend to activate, I have to give it an IP, subnet, & gateway. I even went so far as to give it DNS addresses to my isp, which has never been needed.
ifconfig will show the ip I assigned, but I can not ping out, I can't even ping my dsl modem's ip.
Is there a firewall type setting that I don't know about? As I said, I know it works with other distros using DHCP.