I know on windows there are a bunch of installer tools you can use to create an installer, but on Mac OS I\'ve seen two ways to install apps:
A DMG file which y
Packages works well. If your deployment process must be kept simple, it is great.
The Quick build consists of dragging your .app onto Package and it is done.
Quick build
.app
Package
For advanced packaging, you can also provide a certificate.
http://s.sudre.free.fr/Software/Packages/about.html