If you’re interested in running the latest nightly build of Chromium, Google’s Mac version of popular browser Chrome, then give this a try
I was surprised that something like this isn’t already available so I whipped it together with some AppleScript AppleScript Objective-C (ASOC).

Just download and run this app and you will be prompted with the latest build number, and Safari will download the latest build to your regular Safari Downloads location.

Also available at Softpedia

Download Application (zipped)
Update: Now available on GitHub

Revison History
v1.2
26 August 2011
- Updated source URL
- Added application icon (sorry its rubbish! New icons welcome for submission!)
- Updated version checking process

v1.1 (Download old version)
5 November 2010
- Updated Chromium Source URL
- Added Version checking

v1.0 (Download old version)
- Completely rewritten in ASOC
- Added Graphical Interface to provide user feedback.