Have you been sitting around for the last hour thinking "man, it would sure be great if I could add Images to my site on install but I just can't find a code example"? I know I was. Consider it documented!
There will be a slideshow in the Plone Conference 2011 website (it's coming soon I swear!) that we wanted to work on install since it was 1. on the front page and 2. a PITA to set up every time. The code below gives "a" way to do this, although it could be taken to a much more abstracted level (what couldn't?!?).
This assumes that there is a folder called images in your generic setup profile folder, which is likely to be in ... > profiles > default > images. The nice thing is that it doesn't rely on the magical, mystical .content jiggery. I won't rehash the code comments, but if you are using the slideshow product then maybe this cantation is for you!