We use
www.tubesitessubmitter.com
It's pretty good, a little clunky around the edges but more or less gets the job done. It filters out what tubes it uploads your videos to based on the keywords you select. We usually get +/- 100 tubes available depending on the targeted keywords and it has a failure rate of about +/- 20% of the tube available.
So if getting your video on 80 - 100 tubes in about 10 minutes is worth it to you, then I recommend this one. If you want more, I'm not sure if any tool is better but this is the one we chose.