Uploading watermarked videos is very good. If your video gets featured you can receive thousands of type-in visitors in one day. Here is the list where you can upload:
http://www.xvideos.com/
http://www.tube8.com/
http://www.spankwire.com/
http://upload.hardsextube.com/
http://www.shufuni.com/
http://www.cliphunter.com/
http://www.slutload.com/
http://www.extremetube.com/
http://www.madthumbs.com/
It seems that any other tubes are useless for this...