This YouTube production by englishteacherguy explores why we need to capitalize letters, both for the reader and for the writer, all to the soundtrack of "We Didn't Start the Fire"!
Source: YouTube
This PDF color codes the three rules regarding capitalization and titles.
Source: Kathryn Reilly
This video introduces why capitalization exists and reviews several examples of general versus proper nouns.
Source: Kathryn Reilly
This "music" video (shared in Texas twang!) briefly reviews the most common capitalization rules.
Source: YouTube.com