If you’re the type who uses lorem ipsum content in your mockups, it might be worth considering some content with a bit more character. H.G. Wells, Herman Melville, and others contribute their public domain works to a pretty useful content generator.

It’s worth mentioning that filler content isn’t always the best approach. I personally try to use realistic content as often as possible these days, and chances are pretty good that your users won’t be producing the same content Melville would.

This would be even more useful for me if there were a decent API behind it.