I understand from FAQ that the Tutorial section does not take move guides. There is a 'post moves here' thread in the Wii forum. Is there a similar thread for PC/Mac Toribash?

It's called "YouTube". Might as well wanna see www.youtube.com
And, one tip to become a real toribasher, make your own moves! Happy toribashing!
And I see you are white belt, if you have other questions just PM me

At the moment there isn't anywhere were you can go to find moves, as such. If you're looking for some moves for a specific mod then try searching for that mod in google.
"wushu guide tutorial toribash"
Some of the guides have moves and concepts for moves along with lots of other useful information.

But truly, the easiest and best way to learn is to just play, experiment, fail, and learn from the mistake you just made. The learning curve is fairly high but if you persist with it one day it'll just click and you'll have an awesome game to enjoy.
Good luck.

(Oh, most of the time if you join a server in game where higher level players are playing they'll be happy to show you some moves. Toribash has an awesome community.)