This is my, first pass, attempt at providing a very basic Anki/Super Memo like functionality in Tiddlywiki. From a quick search It seems a few people have had similar ideas recently :)
Setup is pretty simple. Tag a tiddler with "$:/tags/twsr" and any other tags that match subjects you want to study. That tiddler will then show a interface for you to be able to review/add/grade "cards" that match the tags you have supplied.
In the example linked to above, i've tagged the example tiddler with 一画, 二画, 三画, 四画 & 五画 (1 stroke, 2 strokes, ...5 strokes in english) so any Japanese characters matching these number of stokes are possible candidates for revision in this tiddler. They will not be added however unless you click the cog icon and select +1,+5,+10 which will the selected number of cards to the scheduler.
lastly, you can add a <$question>...</$question> segment to a tiddler which will be hidden when viewing the tiddler normally, but when appearing in a scheduled card within a twsr tiddler will be shown instead of the main contents. When the user clicks "show answer" the main contents will be displayed. If there is no question segment the main contents will be displayed by default.
Thanks!
James