How to use Older versions of Safari on Mac

For some testing purpose I needed Safari 2.0 on Mac OS X 10.4 [Tiger] as well as Mac OS X 10.5 [Leopard]. Few links which I felt are really helpful are:

http://michelf.com/projects/multi-safari/ - This link contains a number of old versions of Safari

http://tripledoubleyou.subtlegradient.com/stuff/Safari2/ - This link provides the method to install the Safari 2.0 on Mac 10.5 Leopard. I am just copying it down for backup purpose:

1. Download the zip — Safari 2.0.4.zip

2. Unzip the zip

3. Drag Safari 2.0.1 into your Applications folder

4. Wipe your LaunchServices cache by executing following command in Terminal:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user

5. Enable the Debug Menu in your new Safari 2 by executing following command in Terminal:
defaults write com.apple.Safari.MultiSafari204 IncludeDebugMenu 1

6. Launch Safari 2.0.1