This is a hard question - lots of personal bias from me, and changes over time in my viewing.
I watched Great Escape five times because I was crazy about Steve McQueen that year.
But, some movies I'd like to see once more -
Kurawawa's Ikiru. That's hard to recommend, others might not like it.
I crave to see Bertolucci's Besieged again.
I used to like every movie Phillipe Noiret was in, like the Clockmaker. (L'horloger de Saint-Paul). Wonder if I'd still like it.
Oh! I just remembered Big Night. http://www.imdb.com/title/tt0115678/
Loved it, could easily see it again.
I've seen Night of the Shooting Stars (La Notte di San Lorenzo) twice. Bit of a strong movie.. so, not for everyone.
Not sure my list is composed of stocking fillers - maybe Big Night and Bertolucci's Besieged.
A movie I couldn't sit and watch that everyone else on earth loved was Princess Bride.
It's hard as well to figure out whether to link. So many times I prefer to know nothing when opening a book or putting a dvd into my Imac, while back covers of books and film websites can be quite the spoilers.
There have been some great movie threads on a2k. I wish now I could find where fbaezer listed his favorite films..