I've written a feature article for the latest issue of InDesign Magazine (Issue 30) about how to format a Table of Contents (TOC). The seven-page article is about how to format many different types of TOC layouts. Even if you never work with TOCs, you will learn something new from the article about tabs, indents, special characters, GREP and other formatting options. Of course, Issue 30 is chock-a-block full of other great articles and tips too!
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If you're serious about taking your InDesign skills up a notch, I highly recommend this magazine.