TOMIS Dear developers, please just put your entire application in a proper .app package ZIP'd up. If you need to instal support files, do that on first-run.
If, for some crazy reason, you absolutely can not get around the need for an installer, then grab Apple's Xcode, instal it, and go to /Developer/Applications/Utilities/PackageMaker.app
You can add scripts to your instal and all that niftiness, and do it using the native installer package format that users expect and trust.
(Version 6.0.2)