With the flood of good games continuously grabbing our attention it becomes more and more difficult to have time to play a game more than once before moving on to the next (not including MMO's, shooters or sports games). I probably have enough old games that I enjoyed once to last me two years solid.
Such games include:
Xenogears
Chrono Cross
Final Fantasy 8-10
Wild Arms
Dragon Quest 8
What games are on your list of "would like to play that again if I had time"