I’ve noticed that people are often unsure why you’d ever want to use the Sharp mode of the Remesh modifier, rather than Smooth mode.* One simple example is 3D text. Converting 3D text to a mesh will tend to give you lots of skinny triangles; if you want to sculpt or animate the text, a more regular tessellation could be quite helpful. Sharp mode then gives excellent results. The edges of the text are pretty much perfectly preserved, and now you can go add fun things like a Cloth modifier and watch it deform much more smoothly.
Meshes created with the Boolean modifier are another good candidate for use of sharp mode, as can be seen in this old demo video: http://vimeo.com/21330126
* People do correctly understand that the Block mode is mostly a gimmick.