I've implemented the back layer in Udo for the parralax effect:
So the sky, the mid layer and the fore layer all scroll at different speeds which looks quite nice. Graphics are a bit basic at the moment, but as usual they are all specified in the various files so can be changed easily.
The back layer is actually getting a file all to itself since I figure I can share the back layer between several levels that have the same theme.
Anyway, good to be back and I need to go catch up on the other journals.