First of all i am well aware of this Question and i have a strong feeling that it was closed because it was asked by a google critic.
My sub-question is: Am i right to assume that the processing that is described here is done after the ttf creation meaning it would not be possible to just batch convert them all together? If please tell me how (on linux)
Even if it would prefer the actually files google serves rather then having web services or tools convert them because google might done this the absolute best way possible!
I have some feeling that there is something out there, somewhere. Because it maybe just needs a script that changes the browser referrer and asks google http responses, downloads them and renames them to names based on the 'local' fontname in the css. In addition some web scraping to the the font names and the possible variation (bold/normal/...)
This is why i am trying this again in addition to that: I am a web Programmer i need this for my localhost web development so this is a this is a perfectly valid question for Stack Overflow in my mind and i am sure many have the desire to get hands of all fonts an easy way. So please at least migrate it somewhere it you think its not a valid question!