Someone has uploaded Akira Kurosawa’s Rashomon, Sanjuro and Yojimbo to vidiLife, a service much like Youtube. While the earlier Google Video versions of Sanshiro Sugata and Rashomon may or may not have been legal use of the now out-of-copyright films, these clearly aren’t, as even the version of Rashomon there is the Criterion Collection copy.

In case you are interested, however, you can take a look here:
Rashomon: part 1, part 2, part 3, part 4
Yojimbo: part 1, part 2, part 3
Sanjuro: part 1, part 2, part 3, part 4, part 5

Picture quality there is of course rather horrible.