Phonetic alphabets are very useful for spelling complex words and names over the phone.
Online tools that can help you write your name in unique styles and different languages.
You can use these Google Maps to see all street names and roads that have the same name as you. Data is also available for Google Earth.
If you are trying to teach you kid to learn their alphabet, these cartoon images of animals shaped in the form of letters should help.
If you are the kind of person who looks out for Indian (or Indian sounding) names on blog comments, forum posts or any random list of names, Desi Filter could be a useful addition to your arsenal.
If you have been looking for a name for your baby, NameVoyager, a simple tool that displays US baby name trends by letter (or phrases) with data going back to late 19th century, could be very useful.