S3 Mashup Designer Training

There should be something on the Infor website otherwise, I know that Patrick Dowd from Infor does a number of training classes on-site as well.
That is what we did. The training manual is put together well for this training, it starts with spoon feeding all the info in example 1 and by the time you complete example 5 you have to remember some of the steps yourself to get the results. Examples build on each other to build your knowledge.

Other things you can do to get started is to look at the S3 Tech blog as well as the examples in the New Templates within the designer. They give you some good ideas as to where to start. There were several examples on the old Lawson Marketplace that were helpful from a conceptual standpoint as well.