A simple google could have answered that but anyway, here's a link which will answer your doubts and also some of mine 
: https://bitcointalk.org/index.php?topic=178608.0 Cheers
Chill out bro, I have known about it. I see those badges, but I think they are a bit different from art contest badges. : https://bitcointalk.org/index.php?topic=178608.0 CheersBitcoin expert, Bitcoin-Qt core developer, and the Glider deserve to be permanent (no doubt, surely). But I am not really sure about art contest badges if we consider the impact of their contributions on our forum. IMHO
Ah, i reckon all badges are permanent. Anyway , i'm sure someone with more knowledge about it will comment or maybe @theymos himself.