I get a little bit sad when people refer to a wallpaper that doesn't save their screen as a "screensaver". I get a little bit sad when people refer to any bit of audio/video put on a website as a "podcast" rather than that being the word for a series released with a feed. I get a little bit sad when people say they "wrote a blog" to refer to an individual post on a blog in a way they wouldn't say "I published a newspaper" if they wrote one article in a newspaper.
But language follows use. And all those uses are now very common.
@slowe I was just thinking about the "screensaver" one a few hours ago - it drives me up the wall because the background picture is doing the *exact* opposite of an actual screensaver!