For the copywriters & the grammar nazis:
The Oatmeal comes up with a handy guide to help you remember when to use i.e. vs e.g. in a sentence.
In advertising, every little detail counts. Being able to differentiate between i.e. and e.g. may not seem terribly important, but -when the time comes- it could help keep you from looking like a complete idiot, e.g., an incompetent fool, a dispensable dummy, and an ignorant nincompoop. Oh wait…was it e.g. or i.e.?
See? It can all be pretty damn confusing.
Good thing there’s a guide: