Since there appears to be so many fans around here, I suppose this won't be too off-topic.
Like I mentioned before, something like this is taking place:
The "Make Suzumiya Haruhi no Yuutsu's ED "Hare Hare Yuukai" Oricon Number 1 Project"
For those of you who are not familiar with the term, here's the wiki entry on Oricon
Now, some of you might go "I don't live in Japan, how can I help with the project?" Well, you can! Amazon.co.jp is an Oricon participant, and they ship music CDs internationally:
Hare Hare Yukai
Simply preorder it, and you will have done your part in supporting the project.
By the way, "Hare Hare Yukai" is currently ranked no.2 on the Amazon music CD sales chart
Also, the release of the CD is on May 10th, try to preorder before then, that way, you'll increase the chance of it topping the daily charts when it's released.
While you're at it, why not purchase the OP, "Bouken desho desho?" as well? (currently ranked 7th on the Amazon sales chart):
Bouken desho desho?
Want to show just how much of a devoted fan you are? Here's your chance.