It is common in English-language publications to capitalize words in the title (the full detail on rules behind “title case” in this Wikipedia entry). Once (in the early days of printing), it might have been a good way to emphasize words. In today’s PowerPoint presentations I find that title case actually makes it harder to read the title of a slide.
I do not use it.
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I use it most often in differentiated levels of headings. Because I produced a lot of technical material, I presume that my readers are going to skim. I try to keep higher level headings short, not full sentences, and often make lower level headings full sentences so that the become a form of pull-quote. The idea is to be able to communicate something of the overall point to the reader if they only read the headings.
So for the higher level headings that break up the text into broad categories I use Title Case and for the lower level headings that communicate the actual points, I use Sentence Case.
August