More real estate devoted to the important components
User can go backwards and forwards at their own pace (especially once the data has been cached on the browser) using a gesture they are familiar with (instead of clicking the slider)
User's eyes don't have to leave the map (so they can spot subtle transitions)
Problems:
It may not be readily apparent that the transition is between months
Initial slowness because of dynamic data load
User can't jump to a specific month (unless typed in the url)
More of an enhancement: Get rid of the slider and update map based on user scroll of the page. Example: http://ihatetomatoes.net/merry-christmallax/ Benefits:
Problems:
Thoughts?