I'm looking for a good online site to keep track of chinese words I've learned. I've looked at memrise.com, but found it lacking in features since its not linked to a dictionary and I have to manually enter character, pinyin and english. I've also looked at http://www.nciku.com/ which seems to has a nice vocabulary list which is integrated with their dictionary. Both of these sites also has the ability to generate "tests" for you to help you test and remember things you've learned in the past.
Are there any other options available out there? What are you guys using?