It is important that Ubuntu is polished up to the little details. You are encouraged to add more cases or improve existent ones!

Some cases that can be improved

Places

Removable Media

attachment:places2.png attachment:removablemedia2.png

Added buttons to eject/unmount the media easily.

Bookmarks

Before:

attachment:bookmarks1.png attachment:bookmarks2.png

After:

attachment:bookmarks3.png

This menu shows now the 3 most used bookmarks and hides the rest under a submenu (instead of hiding all of them).

CD/DVD Creator

attachment:cdcreator2.png

Added the "Clear" button.

Nautilus keyboard navigation

Pressing right arrow in the last column should move selection, as the red line shows: [http://launchpadlibrarian.net/11627060/keyboard-navigation-expected.png]

By analogy, pressing "<-" in the first column should move to last column in the previous line.

Context sensitive actions

attachment:archive.png

When the mouse is over a file, one (or more) clickable icons appear in the corners, this icons enable the user to do useful actions. Example shown in the image, when the user clicks the green arrow, the contents of the archive are extracted in the container folder.