Via [The Tin Man](http://www.tinmanic.com/archives/2005/01/21/non-errors/) comes [this helpful site](http://www.wsu.edu/~brians/errors/nonerrors.html) listing a lot of the most common “non-errors” in English. A non-error is defined as one of those prescriptive rules of grammar or usage that fussy people insist on pointing out, even though they’re generally wrong. For example, “since” versus “because.” I agree with pretty much every point made. In this case, if a “mistake” has been consistently made since the 14th Century, you really can’t call it a mistake.
It’s certainly [worth a look](http://www.wsu.edu/~brians/errors/nonerrors.html).
While you’re at it, you might also check out my earlier rant about [“data.”](http://johnaugust.com/archives/2004/data-is-singular)