Hey all,
I've bought a few bits from Belkin who seem quite happy to support FreeBSD! Last time I bought a UPS from them and it's still going well 
I saw this on their website that the 16bit PCMCIA card was supported under FreeBSD:
http://www.belkin.com/network/F5D5020.html
I went to my local "PC World" and bought it. I turned on my FreeBSD 4.6.2 Laptop, stuck the card in, the card was "sensed" as inserted, but nothing in "ifconfig" - ARRRGGHHH!!!
Anyway, after much trying, I got it working. Here's the solution for your /etc/pccard.conf file should you need it:
# ----------------------------------------------------------
# Belkin F5D5020
card "Belkin" "F5D5020-PCMCIA-Network-Card"
config auto "ed" ? 0x10
insert /etc/pccard_ether $device start
remove /etc/pccard_ether $device stop
# ----------------------------------------------------------
Hope this helps any of you that decide to buy it! 
I'm happy with it!