decent

Now this is decent, even though it's useless, it took skills to make, so I'll give you that. =)

This was awesome

and to the last guy, NOT EVERYONE HAS MS PAINT.
This was a nice flash drawing game with a nice save feature. If you make another u should add special effects

Crap.

Not only does this game need a faster way to erase, we need to erase this game. Do something different instead of a paint clone. EVERYONE HAS PAINT!

Didn't like it.

Like someone before me said, there really needs to be a quicker way to erase. Also, Maybe you could put in some shapes or something to make it more interesting. I've seen too many games like this on Newgrounds.

Only one drawback

I didn't see any way to quickly clear the entire screen (i.e. reset button). Besides that, I think that this takes the drawing flash to a new level with color choices, thickness choices (I loved the custom button, great idea), etc.
As far as making something that is similar to existing windows programs, yes, it is somewhat redundant, but I hope to see you keep adding to it. I know that something like a fill tool would likely be very, very difficult, but different shaped brushes, things like that could make this a little more unique.
Amazing job on the actionscript, can't wait to see your next flash