I just bought one of these of ebay for £10, plugs straight into the raspberry and worked with raspbian straight out of the box, installed network manager on xbmc
and search found my access point and put in the sep key and straight on no problem, its not as fast as the belkin at an amazing 300mbps but i get 150mbps
which is ok with me!! works a treat. much smaller profile that the belkin adapter and still has a led for activity. Id say buy one !