I've made a bookmarklet that you can use to add any Chinese word to your Skritter queue. You drag the link to your bookmarks bar, then when you're browsing a web page, you select an unknown word and click on the bookmarklet. Bam, into your queue.
It's the last tool on the vocab page:
http://www.skritter.com/vocab
Try it out and let me know if it works. (It doesn't work for Japanese yet.)