http://forums.sudhian.com/messageview.aspx?catid=43&threadid=60813&highlight_key=y&keyword1=pn15
Airvast
http://www.airvast.com/


Both the PN11 and PN15 are simply repackaged products made by a small company called Airvast with a few small modifications (like the USB cable and external antenna). 

The PN11 is actually the Airvast WM-168b. http://www.airvast.com/new_page_8.htm 
Meanwhile the PN15 is actually the Airvast WM-168gi. Sadly there are no product pages for their WM-168gi product. Their site doesn't appear to have been updated for ages (besides the downloads that is). 

(Site is: http://www.airvast.com/ and downloadable files from: http://www.airvast.com/new_page_24.htm). 

Both use some sort of Prism chip, but beyond knowing that, I don't know for certain specifically which chip is inside there without opening them up (and voiding warranties). Many months ago I pointed a friend to use the latest Airvast drivers for his PN11 and it worked like a champ. For the PN15 though, the same drivers that come on Shuttle's CD are the ones on Airvast's site. 

Latest WM-168b (PN11) driver: 802.11b_USB_multi-language_v3.1.3.zip 
Latest WM-168gi (PN15) driver (currently identical to the ones that come with the PN15): 
802.11g_USBstick_Spinnaker_ver3.0.12_0512_CD.zip 
(file is mis-labeled...actually version 1.0.8) 

Edit: The new Shuttle PN15g appears to be an entirely different beast based off of a ZD1211 chip from ZyDAS Technology Corporation which I've never heard of before. 




http://www.airvast.com/download/802.11g_USBmodule_Spinnaker_ver3.0.12_0512_CD.zip