When ever throwing around templates and mock layouts ive always found my self using

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed vehicula justo at risus. Ut sit amet orci sit amet tortor ultrices condimentum. Sed dignissim odio a tortor commodo ultrices. Nullam hendrerit sapien quis eros. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Nulla scelerisque. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos hymenaeos.

from my snippets without actually know much about it.
Well on the lookout for a generator of the text i came across lipsum.com, which not only has a handy generator which can create paragraphs and lists but it also tells you a little about the history.