GIF Movie Gear is awsome,i'm using the 30 day trial (29$US),a bit expensive but i might actually buy it.You can import avi,export gif,swf,etc.It's worth checking out if your into animated avatar creation,or any animation for that matter.It's a very clean app in my opinion.
From what i see it's an uncrippled 30 day trial so even if you just need to do some quick animation it's worth
And though not as good,but decent none the less is Easy gif animator from blumentals,($19 US)
I actually bought this a few months back and i'm satisfied with it but Gif Movie Gear i'd have to say is
On a side note ,Blumentals has some pretty good software,i've purchased Easy gif animator,WeBuilder 2006,
and screensaver wonder off them and i'm satisfied with all,they have a forum as well which is always a plus.