ok the 2100 3B does *NOT* need ndiswrapper to get it going. that's good news. more than that, the ipw2100 driver is a stock part of the kernel on FC5. as such, is it not even loaded already? what does "lsmod | grep ipw2100" show? if nothing, just try "modprobe ipw2100" and see if it takes it (check dmesg output).
if you do want to go to the original project page - http://ipw2100.sourceforge.net
btw... that's a crappy thread title, pick a better one next time ehh?