Lists.

Are you a list person?

McSweeney's has an impressive list of humorous lists. Like,

"Common Phrases Not Written in My High-School Yearbook, for a Multitude of Reasons."
1. Stay sweet!
2. Keep in touch!
3. Don't change!

And this one is funny. So also this one.

Here's a blog by a fellow who collects lists, like this one (click to enlarge - and notice the fifth item):


And here, of course, are Letterman "Top Ten" lists.