Dario Argento is probably the best director within the giallo genre, and also the most popular one. He made his debutefilm The Bird With The Crystal Plumage in 1970, and pretty much set the standard for how a giallo was going to be made. Check out some of his best films here.
Does anybody have a good copy of a trailer for Four Flies On Grey Velvet?? I think there is one on one of the DVD-R's released by Something Weird Video. If someone has it and can rip it (preferably to .vob-files) for me, please contact me.