I use a desk calendar. I have one now with birdies on it. I cut out the cutest ones and hang them up around the office. I have shadowing calendars, on-call calendars, company car calendars… I’d get a cute wall calendar, but all my co-workers would think I was calendar-crazy. For all you lovers of GTD and cute design, check out this site with lots of nice templates for forms, cover sheets, calendars, etc.