If you download Google Chrome from its official website, you will get the recent stable version of the Chrome. But, if you want to try latest features, you need to have beta or dev version.
Here are the links to download different versions of Google Chrome browser:
- Beta : http://www.google.com/chrome/eula.html?extra=betachannel
- Dev (alpha) : http://www.google.com/chrome/eula.html?extra=devchannel
- Dev Version for Mac OS : http://www.google.com/chrome/intl/en/eula_dev.html?dl=mac
- Dev version for Linux (32 bit) : http://www.google.com/chrome/intl/en/eula_dev.html?dl=unstable_i386_deb
- Canary build: http://tools.google.com/dlpage/chromesxs (Read more about Canary build)
- Standalone Offline Installer: http://www.google.com/chrome/eula.html?standalone=1
Older versions of Google Chrome :
FileHippo.com has the complete archive of older versions of Google Chrome. Get them from here.
Portable Google Chrome :
You can run portable apps from USB drive, without actually installing them. Great way to run chrome at public computers. Read more about portable version.
How to Check current version of your Google Chrome?
Very simple! Go to : Settings > About Google Chrome. This panel displays version number and channel information.

How to download Chromium?
Chromium is the open source browser project, and Chrome is built using it. You can install the Chromium and run it along the Google Chrome to enjoy latest and experimental features.

To install Chromium, visit this page and select the latest (or, desired) version/build. You can see links to different releases of Chromium, click on any and select the installer type (.EXE, .ZIP etc.). You can also view changelog and other updates related to a particular release.