Spelling and grammar are “relatively” important to me, and I have found many a mistake on all sorts of websites. I would have thought, though, that a large company such as Apple would double-check everything going out their doors. Apparently not.
Here is a screenshot of the default webpage you from their operating system, OS X, get when you enable web sharing.
The third paragraph should begin “You’re done”, not “Your done”. For an explanation, visit wikiHow. For some reason this is a popular error, although to catch the error all you have to do is expand the contraction in “you’re” to “you are”, and the choice becomes simple. A related example is the difference between “it’s” and “its” (see this article for info).
Oh, and if you find spelling mistakes or grammatical obscenities on this website, you can always quickly let me know. I probably won’t change the offending article since a new RSS item would be published, but I’ll keep your comment in mind when I’m writing my next article!

Couldn’t you just modify the text within the SQL database field, or whatever you use for backend storage of the content?
I’m assuming you are referring to my last paragraph? In general I try not to touch anything related to RSS because of the chance of something wrong going out to everyone reading it, but yes, I could probably get the correct spelling to change on the site without the RSS module picking up the change. I’ve gotten more familiar with Drupal since I wrote this entry.
Thanks for visiting!
Amen, brudder! The quality of what is produced on “highly professional” brochures and information packages is nose-diving indeed. The two examples you proffer are irritating. My personal irritant is the incorrect usage of “their”, not in the their/they’re/there meaning, BUT as in: ”The company maintains that their quarterly profits….” or “Everyone has their bad days..” A company is SINGULAR. ”Everyone” is SINGULAR. But we’re talking to a brick wall of new graduates whose teachers themselves forgot correct usage.
So, getting back to Apple — keep us posted about what’s new coming from that direction.
Thanks for your example, and yes I agree “their” is meant for plural contexts, although I believe it is also possible to use it instead of “his/her” (which would put it in a singular context).
For example, “Billy got in his truck” could not be altered to read “Billy got in their truck” although changing “the student got in his truck” to “the student got in their truck” would make sense.
Anyhow, “their” is definitely not my favourite word when it comes to grammar…