Cold Sesame Noodles
Are you looking for a particular style? I haven't found a great Taiwanese cold noodle, like the kind you find in to go boxes at breakfast places.
However, if a more peanuty/spicy version is up your alley, Z&Y in Chinatown has a nice version. You have to like thick noodles and a sauce that's more on the dry side though.
Z & Y
655 Jackson St, San Francisco, CA 94133
Vin Pearl in Dublin has their House Noodles. It had shrimp, chicken, fried egg strips, noodles, cilantro, with a very nice peanut sauce.
If you don't mind it coming out warm, Sichuan Fortune House in Pleasant Hill has a couple of versions - Dan Dan noodles and another one that I can't remember the name of.