Instyler Ex-it! for Windows Installer
Instyler Ex-it! for Windows Installer is a powerful helper application to create single executable files from your Windows Installer (msi, msp, msm) files. You can create an executable package file that performs a version checking on the user's Windows Installer Service. ... Test it. ... Plus: the new integrated block-wise compression algorhythm creates smaller output executables in most cases because of msi database headers that can be compressed very good. ... Any prompts and language texts on the wizard pages can be adapted, a silent mode is also available.
http://www.instyler.com/files/exitmsi.exe - 741Kb - Download - Screenshot

MAKEMSI
Create or update MSI (Windows Installer) based installers for files, registry etc using an XML like script. Can use in unattended builds (NMAKE, ANT, NANT builds etc). It builds a HTML report by default (with a "file verify" button). For both beginners and advanced users. ... Also has a framework for easy MSM (merge module) and CUB (MSI validation suite) building. ... Has extensive documentation and a large user group. ... A MSI compare or disassemble tool is available which generates MAKEMSI output, this is commonly used by people wishing to automate tasks they currently use ORCA for.
http://users.cyberone.com.au/dbareis/zips_fw/makemsi.zip - 5Mb - Download - Screenshot

InstallAware Studio Admin for MSI
1-Click Patching InstallAware`s 1-Click Patching is extremely simple, and extremely powerful. Just point-and-click on your old and new setups, click Build Patch, and InstallAware sweeps through each package to capture binary file differentials. It then automatically generates a native Windows... Smaller Dependencies Eliminate bloated dependencies from your setups by recompressing the various MSM and MSI files used by your third-party technologies. ... InstallAware`s MSI CAB Decompressor allows you to unpack the existing CAB file streams and then apply InstallAware`s superior compression to...
http://www.installaware.com/download/installaware_studio_admin.exe - 10Mb - Download - Screenshot