Frederick II exercises a strong hold on some people's imagination. Some good people, and some weird ones. I hope I am one of the good ones. You decide about these:
Stupormundi.it - If Frederick II had his own home page, this would probably be it. (Mainly Italian, some English)
Il sarcofago di Federico II - Official reports on the restoration of Frederick II's sarcofagus, which is in Palermo Cathedral, and the isolation of Frederick II's DNA (Italian).