Resized versions of an image need to be in the same file format as
the original, or at least in a format which has the required
features (e.g. transparency).

The logos of Creative Commons recently uploaded by fajro to omgmg
have bad thumbnails, because the original images are in PNG format
with transparency, while the thumbnails are JPEG. The
black-on-transparent logo became black-on-black, and the
white-on-transparent logo became white-on-white.

Currently media deletion happens like this:


1. Go to media page.
2. Click "delete".
3. Check the "I am sure" checkbox.
4. Click "delete permanently".

If the checkbox at step 3 is not checked, you are back at step 1
(the media page appears untouched).

MediaWiki and file managers do it differently: you don't have to
use a checkbox, but only click another button.

When the checkbox UI is used, but the deletion is cancelled due to
the checkbox being unset, a message should appear to the user, or
he might think that the deletion simply failed.

P.S.: I suppose that checkbox is there because people used to
deleting (or running a bot) may click through many buttons and
accidentally delete stuff. However, when everything uses a
checkbox, it will just slow deletion down and make the user get
used to that longer path. There should probably be a way to delete
larger arbitrary groups of media quicker, at least where it is
possible to upload large amounts of media.

not a big deal, but one of those things to account for eventually.