Bookmarklets are great little things. They’ve been proving themselves useful on desktop browsers for years, and are now getting an extra boost of interest from the iPhone community, because you can use them to make mobile Safari do more things.
The latest I’ve seen is Safari+, which is a collection of a dozen or so useful little commands that you might be used to using many times a day on your computer, but can’t use at all on the iPhone.
So if you’ve been looking for a way to Find in page, or Display all images, or List all links, or Translate to Norwegian on your iPhone – well, your problem has been solved.