As Mark notes in Innovation or error?, a commenter on my post The Languages of the Caucasus questioned my use of entitled with the meaning "having the title", citing a guide to common errors at CMU according to which the correct usage is titled. This may well be the historical usage, but in my judgment, not only is entitled correct, but titled is wrong. To me it sounds awful. Since this does not concern some specialized area in which I am not expert, in which case I would defer to experts, I take my usage to be correct.
I look at it this way: I am a native speaker of English. I grew up in Northern New England. I went to Harvard. I know a bunch of languages. I have a Ph.D. Therefore my usage is standard. Your mileage may vary.