I'm not interested in elevation (I live in holland and it's pretty flat over here!) I would like the option to remove these features to give the calendar a simpler feel.
The formatting of the calendar could be improved as well. Less information should be displayed when looking at the calendar from a monthly perspective (the 'notes' section should only be displayed in daily or weekly views.
Other than that, I think this is a great tool!
I agree with Spartz, the calendar could be improved to show the information in a simple way (It will be excellent if the user can configure what info must be shown). The daily view could be huge if you add several training sessions a day. For instance I use to add one entry for each lap to have a good calculation of the pace.
+1 to this feature. That would be just great.