The dates for every day are missing in the week view.
In calendar 6 they were in the same row as the whole day events below the row with the name of the day. It could be interesting to compare with iCal and Google Calendar where the dates are in the same row as the name of the day.
(And furthermore in the iCal and Google calendars the headers display the dates of the week as a range but in the drupal calendar we see only the first date of the week.)
Calendar 7.x-3.x-dev (2011-Aug-07)
Date 7.x-2.x-dev (2011-Aug-12)
Views 7.x-3.x-dev (2011-Aug-11)
Many thanks for Calendar 7.3 not to forget the new design of the views!