Help a newbie

Hi

I am currently working in a business that uses a SAP r/3 system, and have touched upon basic SAP config, reporting, and a little ABAP.

We are going to soon adopt the SAP enterprise?? and a portal, and so I want to start learning as much as I can before this happens.

Can anyone point me in the direction of maybe some demos? tutorials? sample code etc? I have some experience with HTML and Java, but I have no idea where to start when it comes to SAP...

I've tried searching the forums and the downloads section - but I really have no idea about where to start.

Thanks.

James