Teach capitalization rules as you go instead of in isolation. You may post rules in the room for quick reference, but it is more effective to "teach as you go". For example, during a grammar lesson on nouns, include instruction on capitalizing common and proper nouns. When you teach other parts of speech and encounter titles of books or names of countries and cities, remind the class about appropriate capitalization of these words.
Point out capitalization examples across the curriculum if you teach other subjects. For example, when reading the social studies textbook in the classroom, make quick reference to capitalization of chapter names, headings and places on maps. Seeing capitalization applied practically helps students see its relevance more effectively than copying sentences out of a grammar book and underlining words that should be capitalized.
Reinforce capitalization with small-group activities. Form groups of three to five students. Give them old magazines and have them cut out examples of specific capitalization rules then display them on chart paper or a poster. Scholastic has an online activity outlining ways to demonstrate capitalization using captions located in brochures and newspapers.
Play games so students can practice applying capitalization rules. If you have access to computers, allow students to go to educational websites that offer grammar usage and mechanics games.