singular they

If you want to read a nice history of the usage, here's the MWDEU (link) and a blog entry I just happened to read t'other day (link). The blogger of the latter is a graduate student in linguistics at UCSD. The irony is, how wrong folks usually are about when something started: it's even got a name, the recency fallacy and it's usually blamed on the author's favorite other.

Ceci n'est pas un seing.