I have a success story with the EVO N1015 with a Belkin 54g PCMCIA Cardbus type card.
computer:
EVO N1015v AMD Athlon 2000+
512Mb RAM
Windows XP Professional
(As a side note, i also have a MSI Bluetooth dongle, though this was not attached during install)
I am on the original setup of the computer (factory installed win XP, with all the latest service packs installed)
The Belkin card I have used is the:
Belkin F5D7010xx Wireless Network Card 802.11g (54Mbs) with support for "super g" (108Mbs mode)
steps taken:
download BIOS Update from HP website, i dont remember the version, but it was released in Nov 2003
reboot
insert Driver disk for wireless card, start install, and when the program prompts to insert the card, just plug it in.
It seems to work fine, and there is none of the slowdowns, or lock ups mentioned here.