First off, I loved this site. Though my school keeps a huge collection of Past Papers, not all departments do this, and I've found that FEP's collection is more complete. I'm an IB student myself.
I noticed that people are celebrating that this site is getting more and more hits.
To me though, this is bad. The further up this site goes on google list, the higher the attention it gets. Soon, teachers are going to sniff out what's going on and change their mock examination strategy, which isn't good for the people who rely on cheating to get good scores (I am not one of them, and if you don't believe me, it's your choice).
What's more important is that the big corporate loonies in the exam boards are going to take notice. When their profits are declining because less and less people are buying their rip-off exam sales (though Edexcel made the honorable decision and made all their papers free 2-3 months back), they're going to be more inclined to hire a team of lawyers, or even hackers, to take the site down. I'm looking at you, bastards of College Board and ETS.
EDIT: Where do you get your past papers anyways?
EDIT2: This might interest you:
http://thepiratebay.org/torrent/4031084/Past_IB_Papers_(2000-2007)
I'm trying to find the blog of a dude that had all the exam papers, but I lost the link :/
Just my 2 cents.