Yesterday I finished up a tutorial on how to rig a tentacle and an early version the project is now available for download.
Get the spine project file here http://esotericsoftware.com/files/projects/tentacle.zip
Tentacle rig
- Edited
Great stuff! Thanks for sharing Shiu!
Thanks a lot, very interesting 
This looks cool for tentacles, but the potential is CRAZY for hair. Would be labor intensive, but seems like it could be really stunning.
13 days later
Wow, this is exactly what I need! Could you make an in depths tutorial of this. I've tried to reproduce this effect but I can't put all the pieces together.
19 days later
I've created an additional video that might help you out.