I'm in love : http://www.quickertek.com/products/nquicky.php
I was really getting tired of never being able to get signal with my Mac. I love Apple, but I can't wait till they stop building their wireless antennae into the Faraday cage that is the Ti/Al Book.
I was putting off getting something with 802.11n until it was standardized, but the speed boost I'm getting now is enough, and there will likely be an n card in my next Mac. (right now, the n cards are in the same price range as the plain old transceivers)
The nQuicky looks kinda funny, but it was the only reasonable choice. (!@$!$@ mini-PCMCIA @#$@$@#!%!#$@#@#@#%@#$@#$... and yes, that is how I *really* feel ;-) )
Now to see if it has monitor mode...