I think that Ade used OSGi injection because it is new to SMX 4 and he was trying to get people started with. I haven't watched all the screencasts but I think that NMR could have been used as well.
thanks for your response.
But basically the use of OSGi injection couples the services a bit more than a use of NMR, right?
Does someone know if there are any tutorials (similar to ade's great ones), which show the use of the NMR?