The Secret Workshop - Zipper Tips
A good page of work arounds for changing zipper length and types to suit your needs.

Front Fly Zipper Application
A great Cooperative Extension write up for all the how to's and construction tips on Front fly application zippers.

Perfect Bound Zippers
Instructions for setting a zipper with grosgrain ribbon.

Learn to Sew - Invisible Zipper Application
The Home Sewing Association shares full instructions on inserting an invisible zipper.

How to Shorten A Vislon Separating Zipper
Here's another zipper shortening method that calls for hot glue.

Learn to Sew - Fly Front with Extended Facings
The Home Sewing Association shares full instructions for a zipper application in women’s pants with a fly front. You would need to reverse the directions for men's pants.

Multi Colored Zippers
From Secret Workshop, a great idea for the perfect zipper when making a multi colored item.

An Easy, Flat Fly-Front Zipper - Taunton Press
Sandra Betzina explains how to ignore the pattern instructions and have "ready to wear" results. Video link provided.

Sewing In a Zipper
Tips for installing centered, lapped, and invisible zippers.

Invisible Zippers@ Sew-Whats-New.com
Wonderful directions with a detailed photos.

Lapped Zippers Rule!
They're easier to insert and look better than centered zippers in almost every situation.