If you have been using Interactive Reports since Apex 3.1 landed, you are probably as impressed with them as I am.
The other day I tried to create more than 1 IR on a page and the Wizard prevented me saying "Only 1 Interactive Report can be declared on this page"
I then tired to copy a region that contained an Interactive Report and sure enough I suddenly had 2 IR's on the one page!
Whilst this is probably not supported or suggested, my requirement meant that only 1 IR was to be shown at once (i.e. I had a conditional diaply on both IR)
So if you need to create multiple IR's on the one page but will only display one at run time, copy of a region appears to work!