Here are some useful Flash tutorials:
Toon Titan -
http://www.flashfilmmaker.com/index.php ... 25,0,0,1,0
Keyframer -
http://www.keyframer.com/main/kf_main.htm
Todd Gallina -
http://www.toddgallina.com/how/2.html
I've been using Flash for a long time. It has no 'bones' system. However, its approach to re-usability is better than Moho (IMO), as is the use of sound, and it has excellent interactivity. It was also designed for the web from the start, so its files are very compact. If you look at a Moho .swf exported file, it can only be imported into Flash as a sequence of individual key frames. This isn't optimal, as Flash isn't designed to work like that.
You can make a leg go from straight to bent in the following ways:
1) Frame by frame drawings. Flash has a good 'onion-skinning' system. Gives most fluid animatioin if you know what you are doing, but most time-intensive
2) Use graphic symbols. If you draw a thigh, a shin and a foot as separate symbols, you can animate them as you would paper cut-outs with joints. This is the most efficient system, but you have to work harder at making movement fluid and convincing.
3) Use shape tweening. I have found this to be useful in some situations, but too unpredictable to use extensively.
See how some masters use Flash:
Bitey Castle -
http://www.oohbitey.com/flash.htm
Augenblick Studios -
http://www.augenblickstudios.com/home/index.html
The Little Ninja -
http://atomfilms.shockwave.com/content/ninjai/
HTH
J
You can't have everything. Where would you put it?