Idea: Days Since service.

You go to a website, give it a RSS feed from a WordPress or some other blog (the RSS feed could be one tag or category only, not the whole blog) and the website will automatically keep a “X Days Since Whatever” page for you, with a big number at the top and a list of your most recent blog posts underneath.

Now everyone can set up a site like “Has DC Done Something Stupid Today?” with no programming skills needed!