Please add a warning that when a serif font < 24px is used for the main text, readability is degraded on most screens (new iPad being a notable exception).
Really? I find Georgia extremely readable on desktops and laptops, and the NYTimes makes heavy use of it at 12px in article bodies. Looks a little dated/old school, but I've never heard of Georgia (or Times for that matter) having "degraded" readability.