Yahoo played a dirty trick on its users recently by “resetting” all of their marketing preferences — in other words, turning them all on, regardless of what you had chosen earlier. An alert Slashdotter caught this, and submitted instructions for turning them off. I use Yahoo for a lot of things because it’s convenient and generally trouble free. I’d rather they just start billing me than surreptitiously setting me up to be bombarded with unsolicited commercial email.