Before you send out that query letter to an editor or publisher, make sure it won't get tossed in the trash. Your goal is to get noticed, when you send out this query letter. The day you mail your letter, there will be many other authors will send one at the same time, so you need to make your letter special so it gets noticed and stands out.

Some simple steps you can take to make your letter different:
Single space your letter.
Try to make your letter one page, if it is to long, reduce your font size but do not go smaller then 8pt. Type something in a document and change the font to 8 pt, if it is to small for you, it is to small for anyone else.
Use spell check!
Use colored paper, not to bright but something a little different from all the white letters they will receive on the same day. Maybe gray or ivory, or a pale color.
Use creative packaging to send your letter, maybe a plain white box rather than an envelope. It will stand out on their desk, and get opened first.
FOLLOW UP - call or send a note, calling is better but please remember to follow up!