The Dev channel lets you test the latest fixes and get access to new features as they're being developed. We will release new builds to the Dev channel about every week so that you can preview --and provide feedback on-- what's coming in Google Chrome.
You can learn more about the Dev channel and how to subscribe here: http://dev.chromium.org/getting-involved/dev-channel/
- Scrolling with laptop trackpads is fixed (Issue 4).
- Check for updates works from the About box (Issue 2362, was broken in Dev channel only).
- Removed the separate installer for Gears. Gears is now installed as a versioned component in the same directory as Google Chrome.
- You can now add words to the spellcheck dictionary. Right-click a misspelled word and choose 'Add to dictionary...'
A more complete list of changes can be found here: http://dev.chromium.org/getting-involved/dev-channel/release-notes
--Mark Larson, Google Chrome Program Manager
Link - from Google Chrome Releases