Do some grammar rules seem out of date? Patricia T. O’Conner, the author of Woe Is I, and her husband and collaborator, Stewart Kellerman, have a section about Grammar Myths on their Web site, Grammarphobia. (There’s also a great “question-and-answer” blog.)
Although I’ve warmed up to starting a sentence with a conjunction (e.g., and, but, or) and splitting infinitives (e.g., “take your shoes off” instead of “take off your shoes”), I still have a hard time ending a sentence with a preposition (e.g., to, for, with).