In the German news:
Ryanair is being investigated in Germany for understating the weight of their plans by around 8t, saving a decent sum of fees this way, over many years. Estimations are that Ryanair may be liable for up to 50m Euros (EU airspace, not only for Germany). Ryanair is reported to have declined comment so far.
Ryanair operates a variable MTOW program like many airlines do. The link below is only applicable to UK CAA operations but the IAA has something similar all under EU-OPS. Ryanair operate on 66,9-69,9 or 74,9T MTOW. Has to be changed by an engineer and then signed and stamped in the techlog
http://www.caa.co.uk/docs/33/FOD200920.pdf
Perfectly legal, nothing to see, move along
