Here are some things ready for streaming...these work best with QuickTime 7:

NASA LaRC Moonbuggy Palooza - high
NASA LaRC Moonbuggy Palooza - low
3warriorstrailerstream.mov
new_kittens.mov
sample_100kbit.mov
sample_300kbit.mov
sample_100kbit.mp4
sample_300kbit.mp4
sample_50kbit.3gp
sample_h264_100kbit.mp4
sample_h264_1mbit.mp4
sample_h264_300kbit.mp4
trilogy_stream.mov