Lorem Ipsum dummy text is a popular way of generating random text, and you can get it via the Lorem Ipsum text generator, which is widely used by developers.

Here's something else that's kinda groovy; open MS Word and type the following:

=rand(2,5)

then hit enter. You will get the phrase "The quick brown fox jumps over the lazy dog" repeatedly. The first number decides how many paragraphs there will be, the second decides how many times the phrase will be repeated in each paragraph. Great for testing fonts, or creating 'random' text.