you have the same laptop and wireless card as me.
its all a trick man..yeah the blue light comes on and you can see networks..but..do you notice that they all have exactly the same percengtage of signal strength??
its a faulty driver, the built-in drivers (bcm43xx) or whatever, that come built into sabayons kernel still do not work for a broadcom 4311 rev 2 wireless card.
solution: use ndiswrapper
it's the only way man, its already installed in sabayon, all you need to do is find the proper windows driver and then install it via ndiswrapper
NOTE: I still have not tried the new "b43" drivers or wtf-ever they're called..they're supposed to work with our wireless card now but i still reccommend using ndiswrapper, cause it just...works