Of course, 2 caveats:
a) It's a personal decision, and varies also with the audience.
b) Use sparingly. Let me repeat: S-P-A-R-I-N-G-L-Y. Too many is just as worse as web pages filled with repeated exclamation marks, 1,001 font colors and sizes, and bouncing, animated graphics that distract.
Because that's what will happen. It will
distract. Not force the reader to focus on and retain the critical point you're making.
In fact, using too many formatting changes and emphases will cause the entire copy will look the same, making the "emphasis" backfire and the whole copy look like one big blur of sameness (and easy to scan and skip).
Remember, formatting is meant to highlight key points or drive critical ideas home... not "blend in" with the rest of the copy so that the emphasis becomes de-emphasized.
Now, here are one or more of the following formatting tricks
I personally use...
1. Use it with key word or phrases that are important and you want to drive home, like
benefits,
emphasis,
critical points.
2. Use it with words you verbally change when speaking, in order to apply #1 above. For example, when you pause (pauses are powerful!), use ellipses... when you
INFLECT words, use formatting (bolds, italics, highlights)... when an entire phrase or sentence is a critical point you wish to draw someone's attention...
... Make it its own paragraph.
3. Read my article on "It's not what you say but how you say it" at:
http://michelfortin.com/archives/200...ot_what_yo.htm