Some may find this useful:
SWF Decompiler 4.5 is being given away for free until midnight tonight (March 23) at
http://www.giveawayoftheday.com/.
Apparently this program is very useful for modifying existing flash animation. I'm not a flash programmer, so I can't give a first hand account if this is any good, but most of the comments are raving about it. I've downloaded this and will play a bit.
Just thought some of you might like to know.