Welcome to all the new subscribers to this mailing list. :-)

A few recent policy updates:

The practice of overwriting images with red crosses when a "superior" version is available is to be considered deprecated. In other words: please don't do it anymore.

Please only delete redundant files if they are no longer in use anywhere in Wikimedia. Use the "check usage" tab on the file description page to do so. For the PNG=>SVG transition, tagging obsolete PNGs with [[Template:SupersededSVG]] is preferable to deleting or overwriting old images.

Overwriting files by someone else should be done with extreme caution, especially if the file is in use in Wikimedia. In most cases, it will be preferable to upload an alternative version, and point people to it. Many photographers understandably do not appreciate it if their work is substantially altered -- even more so, if that alteration is made on Commons and silently propagates to a project that uses the photo.

That is not to say that the "wiki principle" of editing does not apply to images and other media files. Consensus and caution are just much more advisable here due to the crossing of project and language barriers.

There has been a lot of recent tension between users from other projects, and Commons admins, and I hope that these changes will improve cross-project cooperation.

Arnomane and Duesentrieb have been working on updating the Deletion Guidelines: http://commons.wikimedia.org/w/index.php?title=Commons:Deletion_guidelines&a...

There is also ongoing discussion about these issues on the Village Pump: http://commons.wikimedia.org/wiki/Commons:Village_pump

Best,

Erik