When Acorn 1.0 shipped it only had a "draw" tool, which is sort of like a traditional pencil tool but with antialiased edges. It worked OK.

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I've been wanting to add a real brush tool for a while, and I'm pretty close to getting it in Acorn 1.5. It's been a ton of fun working on and I've had a blast playing with it. It probably goes a little overboard on the configuration options, but most people probably won't ever see Acorn 1.5's "Brush Designer" if they just stick to the included presets.

Here is a movie of Acorn's in-development brush designer: AcornBrushTech.mov
Things will certainly change before the brush designer is finished, so don't get attached to all the options and layout just yet. But it's neat and I wanted to share it with everyone.