Bart Wessels mentioned a whitepaper which describes the interoperability between SAP NetWeaver Portal and MOSS 2007. It provides a complete overview over all relevant concepts, technical building blocks and integration scenarios known to date. For key scenarios also detailed How-To chapters can be found in the rear part of the paper. I have included the download link. http://blogs.microsoft.nl/bartwe/archive/2008/01/08/interoperability-between-sap-netweaver-portal-and-microsoft-sharepoint-server...
I get a lot of questions regarding licenses for WSS 3.0 and MOSS 2007. Its not that hard. Software License for WSS 3.0 is free when you use Microsoft Windows Server 2003 and you will need a license per server for each MOSS 2007 server. Next to that you have to pay for each user which uniquely authenticate. And there is even the possibility to buy off licenses when you use MOSS for publishing sites (internet sites). At the Microsoft website there is a handy tool called License Advisor which can help...