Darren Shan's UK publishers, HarperCollins, host a Bebo page dedicated for the most part to his demon books, which occaisonally features exclusive info, trailers for the books, and competitions. It's the bloodiest site on Bebo!!! Check it out -- if you dare!!!
The auction home for all things Shanorific. All sorts of stuff pops up here -- first editions, proof copies and ARCs, promotional merchandise, etc. Keep checking back regularly. (And always make sure you check out a seller's feedback before you buy!!!!)