I'm currently trying out the trial version of Flash CS3. In aqddition to the compatability with Photoshop, I noticed the addition of filters which are great.

Aside from ActionScript v3, are all the features in Flash MX 2004 available in Flash CS3?

Of course.. all that and more.

I have looked around the net for free Flash CS3 filters. The few I saw were not free. I'm guessing it's too early ( in the life of CS3) for there to be many filters around, especially free ones.