Some iCalamus users have already upgraded to the newest version 10.6 of Mac OS X, called Snow Leopard. You have experienced that iCalamus 1.16 doesn't run properly under Snow Leopard. We are really sorry for any inconveniences. The new iCalamus version for Snow Leopard is almost finished but we would like to give access to the current 1.20 beta which already works under Snow Leopard.
Many iCalamus users have asked for a plug-in or external tool which helps imposing larger documents from iCalamus. The built-in Imposition plug-in doesn't do what you are looking for. In our manual, we point to a third-party freeware tool named CocoaBooklet which helps imposing documents to booklets.
But CocoaBooklet does only fit for very simple purposes. If you want more, here is another tool which has been localized to German by Ulf Dunkel recently and can now be purchased from us. It is called PDFClerk Pro, a mature v3.9 application which should fulfill your fondest wishes, if you are looking for a powerful tool to handle all kinds of PDF documents and imposition requirements.
You will find more information about PDFClerk Pro in our Additions chapter. Try the current version for free. The full version is only 39 EUR.