how fantastic that we were talking about the same place! i was laughing when i read the postings this morning.
the beauty of Siam, i think, is that it remains relatively unknown, and does its thing without being conscious of what it is doing. LOS and Renu Nakorn are so famous now. I like that Siam is not. chicagoans should feel lucky to have it....when Siam-fan-slash-old-friends come to visit me in New York, i drag them to Sripraphai, which is regarded as OUR best thai (it's actually astonishingly good. just tell the waitstaff, spicy please, and you'll walk out sweating like mid-August). Inevitably, the Chicagoans eating at Sripraphai dig it, but they are always end up saying "good stuff, but it's not like Siam."
btw - norwalk is a really grimy little city off the 5 freeway between anaheim and los angeles. actually, renu nakorn is about 10 minutes (w/o gridlock) from the Matterhorn at Disneyland. it's in a godforsaken strip mall straight out of a Tarantino film - the big sign on Rosecrans says "Tackle-Pizza-Donuts-Thai Food". You have to plan on going there some day. its an unforgettable experience.