I've exchanged a few emails with Siege and bought some of his shirts. You are right, he does the coolest shirts and his websites are brilliant. I spend a lot of time browsing those, mainly for the great photos. But the stories are always great reading too. And as you've noted in the Moto Girls thread, he also has the hottest looking T-Shirt model in the universe...
Edit: And I mean the lovely lady you can see on his site, not that funny Aussie bloke in the piccy above! I am still recovering from his T-Shirt modelling appearance in the latest VMX mag...