Chrome 4 stable was released today. It'd be awesome to have a Portable version! Largely because enabling extensions in 4 beta was a bitch. So now we can have extensions natively, on the stable release 
New: streamWriter (Jun 28, 2024), Platform 29.5.3 (Jun 27, 2024)
1,100+ portable packages, 1.1 billion downloads
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Yeah, I also know that for few hours.
Its great to Chrome 4 stable + Iron 4 stable soon
For some reasons, current "stable" and "beta" channel have same versioning
4.0.249.78 stable
4.0.249.78 beta
4.0.302.3 dev
Still no portable Chrome 4?
Search with search bar on top-right of this page
https://portableapps.com/search/node/Chrome+4
https://portableapps.com/search/node/Chrome+Portable
https://portableapps.com/search/node/Chrome+5
https://portableapps.com/search/node/Iron
https://portableapps.com/search/node/Chromium
And official info about releases
http://googlechromereleases.blogspot.com/
dev chanell
http://googlechromereleases.blogspot.com/search/label/Dev%20updates
beta chanell
http://googlechromereleases.blogspot.com/search/label/Beta%20updates
stable chanell
http://googlechromereleases.blogspot.com/search/label/Stable%20updates
http://build.chromium.org/buildbot/snapshots/chromium-rel-xp/
scroll down the page .... and download .zip archive .... inside latest version number of Chromium .... unzip the file .... copy to USB drive ... done
= You have Portable Chromium (the newest Chrome)
Chromium is open-source