I read this post a while ago. FYI, I just connected my PSP Go to my PC for the first time in a while, and Media Go was quite happy to download the update into the unit's internal memory for updating. Easy as pie.
Also, apparently the Playstation Store (in its PSP-accessible form) is officially dead in most of the world.
http://www.destructoid.com/sony-cutt...s-281034.phtml
Now to see if I can install the 6.61 CFW without bricking anything.