Canvas professional drawing effects

Question

Recently I've been learning HTML5 stuff, especially canvas.
I looked at many online drawing applications written in Flash(e.g. http://www.sumopaint.com, http://www.onemotion.com/flash/sketch-paint/) and they all seem packaged with awesome drawing effects. Smooth lines, simulated pencil/brush etc.

What I'd like to know is - is there a way to get such effects in canvas, and how?
I'm willing to put 1 month of (free-time)coding work to do it, but I'm not sure if it's even feasible.

Answer 1

Canvaspaint.org is an early now-public-domain project along these lines; the source is available here. Here (source) and here and are more recent interesting projects.