Just pushed an update to let you add the summary chart to the diary view. More interesting than it sounds, since once we have a sidebar for the home view (metrics) it will be possible to add it there too and summarise seasons, last 28 days etc.
here is the commit message:
commit d22777ed74ae8a2acf2951e48a4e1a074aa8449b
Date: Tue Nov 13 13:27:36 2012 +0000
UI Nits: Daily/Weekly/Monthly Summary
You can now add the summary chart to the diary
view to get a summary of the date range currently
being summarised on that view.
Once the Home view has its own sidebar that selects
date ranges you will be able to add it there too
and summarise seasons etc.
And a screenshot:

I picked that month coz it was the last time I wore a HR strap for the month, that surprised even me!