Graphs.
Example: I like to sim historical seasons. At the end of the season, I'd like to revisit the pennant race and be able to see which teams faded - or monumentally choked - down the stretch. If I do a whole season on auto-pilot, it's impossible to tell how the season actually played out beyond the final standings.
It would also be nice to see a player's production graphically represented over the course of his career.
For examples of what can be done, check out
FanGraphs.