Lol Furling... the first thing I did when I got Blockland, like the VERY first thing, was right down my key and stuff it in the desk drawer. Of course, I lost the little piece of paper for 6 months and had to PM Badspot to get my key back, but then I found the paper again ;)
I think it's good that you now have to link your forum account with your key, this will eliminate a lot of idiot spammers and alts. It's also nice because he knows that you are the genuine owner of the Blockland key and such.