Colin Günther, the developer working on the wireless support for Haiku has put out this call for testers:

In time with Haiku’s first alpha release I’m looking for people willing to put some time into testing the WLAN-Stack. So, if you are interested read on…
First of all: Only +atheros based WLAN+ cards are supported at the moment. So most netbooks are covered by that. A comprehensive list of supported devices is maintained by the FreeBSD project.
What to expect of the WLAN-Stack:
auto connect to an unsecured (open) WLAN
wlan device will appear as an ethernet card
full support of Haiku’s network configuration utilities (Network preflet, ifconfig)
no WLAN specific configuration utility (neither GUI, nor CLI)
no listing of available WLANs
For more information visit the “haiku-wifi wiki”.