Le Club Accohotels has a new promotion for triple Delta SkyMiles for stays between February 1 and April 15, 2013. The offer is valid at all Accor hotels worldwide. You can read more about this promotion here.
There is no need to register for this promotion, but you need to change your Le Club Accorhotels earning preference to Delta SkyMiles and use the auto deposit option. Le Club Accorhotels will automatically convert your hotel stay earnings to SkyMiles and triple them before transfer.