Fry's (http://www.outpost.com) as we all know sells some cheap airlink wifi stuff. Recently they started offering some higher db antenna's... instead of 5-7 db, 10 db omni's and 10 db directionals. All of them have RP-Sma plugs.
(side note to Beakmyn, ... remember that electronics shop we went to when you were down in Houston? EPO? He is now carrying adapters, like N to SMA (male/female) or to TNI m/f.. cost is about 4.50 each)
So right now I am testing these 10 db antenna's and so far they are not bad.. Nice cheap way to enhance a router's ability.