Well, there is lots of stuff out there on the Internet. The first one that I really like and would definately recommend is:
http://writinghelp-central.com/sample letters.html
It provides many different letter templates and it\'s all really down to earth stuff.
If you\'re running Microsoft Works in your computer, the program itself already comes with a bundle of letter templates and it\'s only a click away and right in your computer. I assume Word Perfect and other Word programs have the same thing available.
The best way to find a good web site, just ask for letters/templates/examples/etc. through your search engine.
:)