Ippon released this summer a new version of SAP connector for Mule ESB:
http://www.mulesource.org/display/SAP/Home
The objective is to provide an open source solution and easy access to BAPIs and RFCs our friend R / 3 without putting thousands of dollars in Netweaver, EAI or proprietary connectors.
Behind the connector found all the simplicity of Mule for routing and processing.
The next steps:
- tests, tests and even testing,
- port in Mule 2.0,
Note that new versions of SAP are "webservices oriented" but until the park R / 3 is huge and will not migrate overnight.


