I've loved lists ever since I spent my childhood Sunday afternoons listening to Casey Kasem's American Top 40 and writing down all the songs. To this day I'm a sucker for anything in list format or, especially, in countdown format. Probably just the way my Aspergery brain is wired.
List making is, of course, a cheap way to get yourself some traffic and a good cure for writer's block. It also helps get you through a slow news season (ever try to do a Christmas Eve 5 PM newscast> I have), as the end of the year is glutted with lists. End of the decade, too? Bonus!