I just love Gmail.
I am just trying Google Calendar, and it looks good.
What I would like to see is Gmail and Google Calendar connected. There are contacts in Gmail. I would like that there is option to add birthday/anniversary field to contact and option to automatically include birthday/anniversary of that contact to my calendar (like Outlook has).
I listen to Gmail Podcast. In Suggest Features episode I found out that I can suggest that feature to Gmail team. If you think that is good idea, go to https://services.google.com/inquiry/gmail_suggest/ and write something like:
Connect Gmail and Google Calendar - add birthday/anniversary field to contact and add option to automatically include birthday/anniversary of that contact to my calendar.