E-mail aside letters

• "Incidentally," in textspeak
• "Oh, another thing ...," in a text message
• FYI cousin
• "And another thing ...," in texts
• "Incidentally" in a chat room
• Texter's 'incidentally'
• "One more thing..." online
• "One more thing," for short
• "Incidentally," online

Wiktionary Word definitions in Wiktionary
abbr. (alternative spelling of BTW English)