Keeping track of words learned
I think a close search of the SE site is what's called for here. Doing so I was able to find a link to Yellowbridge.com and it's memory game (an alternative to flash cards). http://www.yellowbridge.com/chinese/mtch-options.php?deck=ic-1-1. There are other websites like http://lingomi.com and http://zhongwen.com that may prove useful.  Chinesetools.com is another. A Google search will yield many more.