She's still pretty, though it's clear that living on the street has started to take its toll. Bundled against the chilly wind in a blue down jacket, she is one of San Francisco's estimated 16,000 homeless; and looking past her, toward City Hall itself, one sees at least 50 homeless men and women hitting up tourists for spare change, slowly pushing shopping carts as if in a waking dream, or huddling in corners and on steps, half asleep.