Did you replace the wifi card yourself or mail in the whole laptop? Was dell helpful diagnosing this, and what was your general impression of their committment to linux support?
I replaced it myself. Actually, I didn't bother to ask Dell for support ;-)
Regarding their general commitment to linux support: frankly, I don't know. Everything just worked out of the box (besides the Broadcom WIFI, which gave me a hard time), so I have not spent much time to investigate this further.