Statistics tab for "how many cards memorized"
Its very motivating to see how your knowledge has increased over time. It would be nice to have a bar graph that shows, over the last month/year/etc., how many cards were "in the user's memory" at that time. The criterion could just be that the card existed at that time, or was at a certain score, or was up to a certain number of days between repetitions. In the simplest case (just seeing if the card existed), it would basically be the integral of the "cards added over time" graph. It would be great to see some graph that showed that I knew 2000 cards a year ago and 3000 cards now.
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Dan Schmidt commented
Note that this is basically a subset of "add to statistics plugin a visualization of deck growth over time, split by grades" http://mnemosyne.uservoice.com/forums/164265-general/suggestions/3592005-add-to-statistics-plugin-a-visualization-of-deck-g
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Theoretically feasible, but it would be very expensive to calculate and probably require some caching.