"Perhaps you were browsing the code online from your Cr-48, or perhaps you just didn't have Subversion or Mercurial handy. Today the Google Project Hosting team is announcing a new feature for you: the ability to edit your source code files directly in the browser, in our online editor powered by CodeMirror. Just look for the 'edit file' link on files in the online source browser: As you edit, you can preview the diff of your changes so you know exactly what you are committing," explains Google.
The nice thing is that you can edit a file even if you're not a member of a project. After making the changes, submit the new version of the file as a patch, along with a description. If your patch is approved, your changes improve an open-source project.
{ Thanks, Aaron. }