HTML-Ipsum
html-ipsum.com
html-ipsum.com
http://www.lorem-ipsum.info/generator3
I use this usually with English, Greek, Russian, Arabic and Chinese text. This makes me fix up most character encoding issues at the earliest possible opportunity in a project.
This maybe overkill for a lot of development, but most of the sites I have worked on in the past two years have been in 14+ languages.
What is the rationale from the web designers you've spoken to?