Good Question, Gaius Iulius ...
No, you do not have to re-register! You have been an active member during the past year and you were a member before 1 July 2007. However, you can certainly register to become a member of Playmofriends too, but you will have to pay the one-time five Euro registration fee.
Playmofriends is a wonderful forum that is not limited to just toy soldiers!
Thank you for your question.
All the best,