I use a Dell Latitude D610 and the wifi always worked fine for me.
The chipset is 03:03.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02).
I bought this laptop especially for it compatibility with the wifi. That's ode to find a Dell D610 with a different wifi chipset.
