I disagree. Whey you say “I couldn’t care less”, you’re saying that the situation has so little importance to you that it would be impossible for you to care less about it. If you said “I could care less”, you’re saying that it is possible for you care less than you currently care.
? When I say I couldn’t care less, I could not care less. I do not care at all. The opposite for me would be I could not care more. Why would I want to care less than I do if I don’t care about it at all? Bit odd to my thinking. Could be a UK / US thing. I don’t do math. We invented the language, now bog off! HANW… 
I think that everyone is in agreement that “I could care less” is incorrect because it implies that you care about the issue somewhat and thus has very little impact in diminishing the value of what the speaker is saying. “I couldn’t care less” does show the insignificance of the issue being presented and is, therefore, correct. Come to think if it, I’m not sure why I chimed in. I couldn’t care less about this.
just sayin’, also a popular one these days.
Actually, the Germans and the Dutch invented the English language.
There’s a neat piece where Eddie Izzard talks to someone from Friesland in Old English and they can understand each other… http://www.youtube.com/watch?v=OeC1yAaWG34
good vs well further vs farther ain’t
Good ones, well done.
http://www.englishclub.com/english-language-history.htm Good point. You mean Danish, not Dutch. And I don’t think they invented anything as all languages are progressive. Or if you will, the cave men invented all languages :-). The sentence structure of modern day English is French rather than German. We don’t end our modal verbs with the infinitive if you know what I mean.
Just saw this in an effing news article: “You don’t have to spend a week in a bar to find somebody your comfortable with,” said St. Louis Health Director Pam Walker… http://stlouis.cbslocal.com/2011/11/17/online-hookups-blamed-for-jump-in-sexually-transmitted-disease/
Are these grammar mistakes? Language changes over time naturally and I think impact can be quite an effective verb. It is more concise than your alternative. Nothing wrong with punchy language in certain contexts. In-built and built-in can be used in different contexts, no? A wardrobe might be built-in but qualities like self-esteem etc can be in-built. Do people say that X has a built-in sense of pride? Do you prefer that to saying X has an in-built sense of pride? I don’t think either are wrong necessarily.