I have posted the EUMETCast registration form [required for access to MSG-1 data] on the RIG website with a guide as to how to fill in every section. I hope people find this useful.
Also there is a direct link to the EUMETSAT document EUM TD15 Issue 3 - EUMETCast, EUMETSAT's Data Distribution System.
Please read this invaluable document before you begin to set up your system and install the various software's.