Last week Jonathan Delacour removed the calendar from his weblog and explained why in Say goodbye to useless calendars:
it occurs to me that I never use the monthly calendar to access previous posts on my own site or any other site I visit. And, a quick check of my blogroll revealed that only a third of the sites displayed the standard weblog calendar on their main page. Those who don’t have a monthly calendar include links to either monthly (the majority) or weekly archives.
He goes on to complain about weekly archives and their effects on google searches, and he points to a full-screen calendar with post titles and a photo randomizer for a possible replacement tenant for the screen real estate vacated by the calendar.