Hey guys, Everytime I try to use this function it'll just show the "Great Firewall is stopping you" site of Skritter and I have to click there once again. Anybody know how to get the link working immediately in China?

There is a way to fix this so the bookmarklet tool will route through the Chinese portal of the site. By default it's probably using the COM domain. You need to edit the bookmarklet link. It should look like this now:

javascript:(function(){try{var t=((window.getSelection&&window.getSelection())||(document.getSelection&&document.getSelection())||(document.selection&&document.selection.createRange&&document.selection.createRange().text));javascript:window.open('http://www.skritter.com/vocab/api/add?from=bookmarklet&lang=zh&word='+encodeURIComponent(t),'_bookmarklet');}catch(e){}})();

You need to change "http://www.skritter.com" to "http://www.skritter.cn". Then it should work. You can also just replace the link with this one:

javascript:(function(){try{var t=((window.getSelection&&window.getSelection())||(document.getSelection&&document.getSelection())||(document.selection&&document.selection.createRange&&document.selection.createRange().text));javascript:window.open('http://www.skritter.cn/vocab/api/add?from=bookmarklet&lang=zh&word='+encodeURIComponent(t),'_bookmarklet');}catch(e){}})();

Why have I not seen this bookmarklet before? Is it in the faq somewhere?
I don't see myself using it a lot, but I fear I am missing out on other features disclossed at the same source.

@Laspimon: it's under 'tools' in the home page.

I've tweaked the code to automatically have the bookmarklet setup code be based on whatever domain you're on. Until then, josh's instructions will do the job.