I'm not going to fault Codhisattva for calling out the mistake in the title, or even the fact that it irritated him. I'd just like to exhort everyone to also offer corrections with comments like these. If I'm attempting to communicate in another language, having people who are comfortable correcting me (assuming they know what I mean at all) is important.
And I'd also like to point out that even people writing in their native language aren't perfect. We type fast, get interrupted a lot and have local dialects, so it's unrealistic to expect perfection.
P.S. I sure hope I don't find mistakes in this post ;)