The folks at WoWJutsu provide a great little competitive tool that ranks guilds according to the PvE raid content they've completed. The site is pretty popular, and a lot of guilds use it in their advertising over at the Guild Recruitment Forums. My guild has been known to pay pretty close attention to the number. I have to admit that about once a week I find myself checking our ranking against those of other guilds my friends are in.
This got me thinking... what good does basing your progress against other guilds do? Sure, there are the ultra competitive guilds like Death and Taxes and Nihilum. However they approach the game in a way that leads them to needing to care about how close the guild behind them is doing. For most of us, competing against other guilds is only going to lead to unforeseen frustrations. Most guilds have a boss or two that they get hung up on. Back in the days when BWL was hard, my guild spent a long time defeating Razorgore, and after he was gone the rest of the instance fell within a month. This kind of common hurdle in WoW is not reflected in WoWJutsu; all you get to know is that a guild is stuck on a boss, not that they're going to have amazing progress after it.