[DATE, ex. Monday, March 31, 2008]

[NAME, COMPANY AND ADDRESS, ex.
Link Building
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]

Dear [NAME, ex. Link Building],

I would like you to know how pleased I am of the extra effort taken by [NAME, ex. your salesman, Bill Williams].  [STATE ACTIVITY BEING COMPLIMENTED/THANKED, ex. When our order was delayed due to lack of stock, Bill took it upon himself to arrange for special delivery from your manufacturing plant.]

You are certainly fortunate to have [NAME, ex. Bill] at your firm.  We are indeed pleased with [his/her] efforts.

Sincerely,

[YOUR NAME, ex. Jill Jones]