"Examples of films w/ sparse dialog, i.e., Ghost Dog, Broken Flowers..."
Low on dialog.. heavy on subtext, visual metaphors, cinematography, etc.
I just recently watched a few Jarmush films and I really enjoy the subtle way his characters unfold without relying heavily on dialog. Specifically Ghost Dog where Forrest Whittaker and Isaach De Bankolés' characters develop a close bond w/out any coherent verbal communication.