DMG Packager for Mac

From SkoobySoft:

Creating a styled disk image each time you put out a new release of your software can be a tedious process. DMG Packager lets you do the whole thing within one easy-to-use GUI application. Create a dmg, manage your product files, set up and preserve the dmg's Finder window styling, compress it and add a licence agreement - all with a single button-click. You can create a range of presets for different product variants, plus multilingual rich text license agreements.

As an added bonus, you can also create zip, tar, tgz and tbz2 archives.

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