Using 100mm f/2.8 USM L IS macro for portraits?

It is a nice lens for portrait.

Here are some taken outside by someone I know, with a crop sensor, wide open.
You need space to use it and outside is a good place for it, on crop:
http://www.flickr.com/photos/pitoured/sets/72157626585195636/

Here are many samples (macro and portraits) on several format:
http://www.pixel-peeper.com/lenses/?lens=11

Just browse it to make up your mind, knowing that there are probably all heavily post processed...

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Philippe

on flickriver: http://www.flickriver.com/photos/photophilde/popular-interesting/
on dpreview : http://www.dpreview.com/galleries/2067447241/albums