The "show/hide" link can be quite long and annoying, especially when translated, e.g. in Italian it's "mostra/nascondi".
Luckily in page histories now there are only checkboxes, but Special:Contributions and Special:Log are cluttered: those links make other more useful pieces of information (as timestamps) less visible; and the line can be very long, so other (more used) buttons as "rollback" can be moved down in a unexpected position.
I think it would be logical to have them after the history/log entry, as other buttons which let you modify the edit or action (rollback, undo, unblock, change block etc.).

Version: unspecified
Severity: enhancement
URL: http://commons.wikimedia.org/wiki/File:RevisionDelete_pages_cluttered_up_with_show-hide.png