Andrew Sullivan has an entry about "s/he," or, really, the singular "they" with a collegial link that I'll gladly take as an invitation to weigh in on the subject:
"Every mother ... they"
Man (emoticon goes here), do writers and copy editors wish the singular "they" were standard! It's not, yet, but here's why it would be handy if it were: Write "he" about a nonspecific person and you're a sexist. Write "she" and you're a flaming feminist. Write "he or she" and you're a pedant. Write "they" and you're an ignoramus.
We word people can't do much about the political implications of phrasing, so we're left to consider what makes a person look or sound pedantic, prissy, inattentive, lazy, stupid, or ignorant. In the case of the singular pronoun, the version about which it's likeliest that standards will change -- and the version about which we can do the most to change them -- is "they." I'm doing my bit right now.
Apparently, the singular "they" is more nearly standard here in the U.K.: This morning, without even trying, I spotted one in "The Sunday Telegraph," which was delivered to my room along with breakfast. The silly thing is that it was in an all-female context, like "Every mother ... they." Of all places where a generic pronoun is pointless!