I was tinkering around the other day, and cobbled together a little applet that shows wifi signal strength in the taskbar. I know that OZ ROM's have had this for ages, but I've never come across one that works in the Sharp ROM. It probably only supports Prism2 based cards at the moment (I commented out support for other cards 'coz it kept crashing Qtopia on startup - and anyway, I've only got a prism2 card anyway).
I based the code on a combination of my NetActive applet, and the wlanmon program, and it's no work of art - but if anyone's interested, I'll roll in IPK of it....