Decrease or increase line-height based on width to aid readability.
An updated (written in April 2010), well researched, CC-licensed Web safe fonts cheat sheet, available both in low-res PNG and high-rest PDF. Even the article is useful as well.
The Timaru Mental Health Support Trust website, made for charity by Team USA (comprised by web superstars like Jason Santa Maria, Dan Mall, Liz Danzico and Automattic’s John Ford) during the FullCodePress competition, is actually a clever child theme of 2010.
The simpler way to code comment form (once you understand how hooks and filters work).