[texhax] using both sides of page for a 2-up latex document?

[Christopher W. Ryan]

My daughter has to create a simple invitation for her senior art show in 
high school.  I thought it might be educational for me and for her to 
try to do it in latex.  We've already done it in OpenOffice.org, but it 
involved a lot of manual dragging of frames here and there and took a 
long time to get a less-than-perfect layout.

The invitations are to be approx 8.5 inches by 5.5 inches, laid out 
side-by-side on letter paper, in "2-up" fashion, so they can be cut 
apart into two separate invitations.  So far that's easy.

On the back of the text, there is to be an image of one of her pieces of 
artwork. It is supposed to occupy almost all of the back side, save for 
a small margin all around.  We scanned one of her B&W photos into an 
image file (currently jpg, but we could convert it to just about 
anything.)  The thing I'm finding difficult is centering the image so 
that it aligns with the centered text on the front side, so that when we 
cut them in two, both text and image will be in the center (in all 
directions) of their respective now-half-sized sheets of paper.

What is the best latex way to do this?  So far, I have experimented with 
the booklet package.

Thanks.

--Chris Ryan