The recent introduction of the re-fortified, and extremely useful Lorem Ipsum Generator 2 is a good reason to post the other two text generators that reside in my bookmarks.
Using lorem ipsum text in a mock-up is extremely useful as it provides you with as much text as you need to simulate the final layout, while avoiding the distractions of proofing content – well, once you get past the jokes (“It’s all Greek to me”, “I don’t speak Latin” etc.)