How can I make the border of shapes smoother, without re-touching it in detail ?
Is there any Photoshop advanced functionality doing it automatically ?
See example: http://dl.dropbox.com/u/72686/border.png
Some blur, perhaps combined with median filtering. But typically this problem comes from a bad resampling or rasterizing (forgot to check "antialiasing?"), and then it's a little too late to fix it.