Quoting from the Novell official announcement:
Novell today announced that SUSE Linux Enterprise Server 10 from Novell with integrated Xen virtualization technology is now available for SAP NetWeaver and mySAP Business Suite. Jointly tested by Novell and SAP, SUSE Linux Enterprise Server with Xen met or exceeded SAP’s stringent performance requirements for SAP applications in a virtualized environment.
While this is a welcomed news, please note that this support statement is not bidirectional: even if Novell (as VMware already does with ESX Server) claims support for SAP applications in virtual infrastructures, is not granted SAP has same opinion.
In SAP Note #674851 (accessible through SAP Service Marketplace only if you are a customer), for example, the company states support for VMware non-production virtual environments only:
SAP does NOT support the production operation of SAP systems based on the Windows platform. The reason for this, among other things, is that Microsoft itself does NOT support the use of VMWare for MS products. If you still want to use VMWare in production operation, and you require some support, you must give SAP employees access to a system on which VMWare is not operated, but on which the error can nevertheless be reproduced.