Other
A Beginner's Guide to Effective Email: Intonation
A good site as a resource for changing tone and voice in the written medium of email. Discusses asterisks, capital letters, punctuation, whitespace, and lower-case letters.
Other
A Beginner's Guide to Effective Email: Acronyms & Jargon
An interesting and fairly detailed list of many of the acronyms that are used in email. Also discusses some unique internet/email "jargon," such as "spam."
Education Development Center
Alma: Setting the Tone
Discover more about personal letter writing when you use this informative site from the Adult Literacy Media Alliance. This site gives you tips on how to set the tone of your personal letter. This is an excellent resource for all ages.
Other
A Beginner's Guide to Effective Email: Gestures
Another site giving advice to beginning email users; this one deals with gestures in emails, such as smileys, pause equivalents, and creative punctuation.