A few more, if we're still talking 'underrated', and so therefore didn't gross a trillion dollars and don't air every 27 hours on TBS. And which deserve to be seen again or at least once before their celluloid disappears into the ether altogether:

'K-19: The Widowmaker'

'High Fidelity'

'United 93'

'The Wedding Banquet'

'24 Hour Party People' (I know I mentioned this on another thread somewhere, but it's so goddamned good, I figured it merited another plug)

'Chaplin'

'Once Around'

'Grace of My Heart'