wireless cards & Linux

[david]

Greetings

I'm working on a project to roll Linux out across the
NGO/Charity/Voluntary sector and I have 2 offices waiting to be set up
with wireless. They are using Mandrake 10 at the moment.
After having gone through US Robotics cards and D-Link DWL-122 with
absolutely NO luck at all, I'm starting to wonder...
So,
does anyone know if there's currently such a thing as a "works out of
the box" wireless card (PCI or USB) for Linux? 
This would primarily be for Mandrake boxes - however, if there's a
better solution via Ubuntu - I'd be willing to consider it, but the
solution must be utterly reliable and must also involve no beta OS's.
(Mdk 10.2 Beta 2 sees and correctly identifies the d-link cards but
doesn't seem able to use them - "no wireless extensions".)

many thanks

David