Wikipedia has a great selection of LGBT movies. One's sorted by year; the other alphabetically. Some movies like The Family Stone are on the list because it just has one or two LGBT characters (e.g. the son and his partner who are thinking of adopting). Other movies like Shelter are on the list and their whole plot revolves around something LGBT.
It's really handy if you're looking for something independently-produced or foreign.
Looking for anything particular?