802.11g cards with private APIs or command-line tools

Hello all,
I'm working on a headless XPe device that needs to let users configure
802.11b/g wireless access. I've looked at and played with the WPS DDK
preview, released a year ago, but it's rather incomplete and a year
later it hasn't been updated past the preview state.

I'm currenly using a a Linksys WPC55AG, which is A/B/G, and I can't
find any vendor specific tools for configuration (and Linksys flat-out
denies these exist).

I see a lot of people here using the Cisco Aironet 350 card, but
according to their website this is 802.11b only.

I need to minimally be able to add and remove profiles, but I'd ideally
like to be able to iterate through entries and change only passwords,
as well as display signal strength and sniffing information. Can
anyone suggest a specific b/g card with a toolset I can use for this?

Thanks