For security reasons I have Javascript disable in Chrome and I use a whitelist of my "trusted" sites. So If I'm surfing the web and I visit a site that is trusted to me then I add it to that list. Maybe is not the best approach in the world, but is better than allow all.
Where does Google keep the Javascript whitelist so I can export it later? Do you have a better policy to manage the Javascript of the websites ?
By the way, I am using Windows 7 x64 :D
UPDATE!:
The answer given below was really nice but, in my case, I don't have the "Data Sync" folder (maybe because I don't use the Google syncing feature), so I find the javascript whitelist a bit mixed-up within a bunch of JSON data in the preferences file. Do you know at what moment the "Data sync" folder is created?