Today widgets appear on the Home screen when you swipe all the way to the left, beyond the first page of your app icons. For those who don't like to use the Today widgets, this page is a significant waste of space.
A new free jailbreak tweak release called Toka by iOS developer maximehip is now available for those who would prefer to see something other than Today widgets when swiping to the left, as it replaces them with your missed notifications instead.