Lorem ipsum

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Quoting Wikipedia:

In publishing and graphic design, lorem ipsum (or simply lipsum) is standard placeholder text used to demonstrate the graphic elements of a document or visual presentation, such as font, typography, and layout. Lipsum also serves as placeholder text in mock-ups of visual design projects before the actual words are inserted into the finished product. When used in this manner, lipsum is also called greeking.

Here are some lorem ipsum text generators available online:

http://lipsum.com — also has nice history and explanation of lorem ipsum
http://lorem-ipsum.perbang.dk/
http://www.webdevtips.com/webdevtips/codegen/ipsum.shtml