We released the new Iron 9 for Mac today, which contains all features and updates known from Chromim 9. The current version is 9.0.600.2. Mainly the WebGL Support was improved, you can test it under http://www.chromeexperiments.com/webgl. There are also some new experimental features in "about:flags". We removed the "Instant"-Feature for more pricacy.
http://www.srware.net/downloads/iron-mac.zip (OS X 10.5 or greater / Intel)