Ah, business letter format--there are block formats, and indented formats, and modified block formats . . . and who knows what others. To simplify matters, we're demonstrating the indented format on this page, one of the two most common formats. For authoritative advice about all the variations, we highly recommend The Gregg Reference Manual, 9th ed. (New York: McGraw-Hill, 2001), a great reference tool for workplace communications. There seems to be no consensus about such fine points as whether to skip a line after your return address and before the date: some guidelines suggest that you do; others do not. Let's hope that your business letter succeeds no matter which choice you make!