Unfortunately the card is in a friend's machine, so debugging will be hard...
When using the driver for a rtl8185 card, the computer will always hang after a few minutes of system use. (2.6.19 kernel)
These seem to be random, as sometimes it will last only a few minutes and others half an hour, but it never lasts an hour before freezing.
No suspicious messages are found in /var/log/messages or when typing 'dmesg'. The freezes are pretty bad, too, since everything stops working - The keyboard, mouse, etc. Only pulling the plug works.
Confirmed on many distro support forums:
Also, perhaps these can help: