Yes it is still available as far as i know:
http://support.chess.com/Knowledgebase/Article/View/117/0/can-i-pay-for-a-membership-through-moneybookerscom
make sure you included your chess.com username, or else staff will not know which account to add the premium too.
If you sent the payment without including your username please contact billing and premium here:
http://support.chess.com/Tickets/Submit
You will need to provide:
1)Your username
and
2)The transaction number that shows on your invoice email from moneybookers.
Regards
Hydra
Is the moneybookers payment method still valid? I sent 6 euros to moneybookers@chess.com (1 month platinum), but am yet to receive the service.