As written on
"InDesign Imposition Plugin - this revolutionary plugin takes any InDesign document converts it it into a PDF and imposes the PDF onto a new InDesign document all with one click of a button! It can also do saddle stitch booklets and has the capabilties to customise bleeds, gutters, blank pages, shuffle pages and much more!"
"Now has the ability to do 4 up spreads"
and so on.
Now it supports CS5. I have no this version, but you can use version with CS4 support:
And many rhanks to MSJ guys.
And they say: