It looks like people really liked Catherine, enough that Atlus had to take the demo off the PSN. This could be due to over-seas interest of the game and the fact that PS3 is region free, allowing everyone to download demo and surpass Atlus's bandwidth cost. This could, in a way, show them that people are interested in the game everywhere and not just in Japan, which may led in to a release here soon. The demo is still up on Xboxlive by a Japanese account for anyone who is still want to try it out. 
 
http://www.siliconera.com/2011/02/07/sorry-ps3-owners-atlus-pulled-the-catherine-demo-from-psn/

Wasn't it timed? I remember reading something about how it would be only up for 2 weeks or something

they never mentioned a timed limit.
 
and I swear people keep saying that it has a chance of not making it over and those people are DUMB. why do a 360 version if it wasn't coming over?

Well, at least I got it, and it probably means that we've displayed enough interest in a worldwide release.

Well, it's kinda lame that they took it down, but if it helps Atlus make its decision on whether to bring it to the US or not, then I guess that's a good thing. 

This is as mentioned in the Siliconera comments, 100% due to the bandwidth costs that Atlus must pay for the downloads. Either they had a set budget and that budget was reached, so they pulled it down as to not go over or they always had an time frame of how long it would be up. I'm going to assume it was the former.
 
This is why it's still up on the 360. They don't have to pay the bandwidth for those demo downloads.

" they never mentioned a timed limit.  and I swear people keep saying that it has a chance of not making it over and those people are DUMB. why do a 360 version if it wasn't coming over? "

Its due to how Sony charges for downloads from PSN.  

Apparently this is the reason why...

Why? Apparently, the Catherine demo was in limited quantities. An Atlus tweeter explained downloads have hit the planned number, so distribution of the demo is over. TheCatherine demo is still available for Japan region accounts on Xbox Live and you don’t need Gold membership to access it.    

" @Laketown said:

" they never mentioned a timed limit.  and I swear people keep saying that it has a chance of not making it over and those people are DUMB. why do a 360 version if it wasn't coming over? "

I don't think it's up on Xbox Live in the US. The OP mentioned that it's still up on Japan's Xbox Live. "

Cool, this sounds like it may increase the chance of it coming to the US. I am in favor of that =)

Right,I'll remind myself not delete the demo next time I clear my PS3.

This is why we can't have nice things!

Damn, I was actually planning on downloading it today.  But hopefully like you said, it will increase the chance of a global release.

I don't see how this increases Atlus' awareness of Catherine's popularity outside of Japan. In numerous interviews, they've stated that they've been surprised as to how well it was received outside of Japan and I maintain the position that there's absolutely no way there won't be a North American release. 
 
And I'm somewhat surprised to learn that they don't need to pay for the bandwith on Xbox Live as they need to do on PSN. I'm sure most people who wanted to download it already did, though, so I wouldn't think this is that much of an issue.

Sony charges to list it and download it while Live fess help to defray the cost on the MS side.  Its why almost all Xbox game demos stay around forever while PSN demos often will get pulled after a while.

Finally, a negative thing about PSN and a positive thing about XLive.
 
No way I can take the Catherine data out of my PS3 and share it? I know you can do it with the 360, or could, but hmm

" Finally, a negative thing about PSN and a positive thing about XLive.  No way I can take the Catherine data out of my PS3 and share it? I know you can do it with the 360, or could, but hmm "

" Damn, I was actually planning on downloading it today.  But hopefully like you said, it will increase the chance of a global release. "

" @xobballox said:

" Damn, I was actually planning on downloading it today.  But hopefully like you said, it will increase the chance of a global release. "

That just a guess I'm making base solely on the fact that over-seas user were downloading the demo and not just Japanese user. FluxWaveZ is right that it isn't too much of a issue if the people who really wanted the demo already did. "

My condolences to the PS3 owners that were hyped about this demo but didn't get to play it.

I purposefully passed on the demo. Can't go spoiling an Atlus game for myself, now can I?

" I purposefully passed on the demo. Can't go spoiling an Atlus game for myself, now can I? "

" @FuzzYLemoN said:

" I purposefully passed on the demo. Can't go spoiling an Atlus game for myself, now can I? "

Didn't see much spoilers for me in the demo. Then again I can't read Japanese, so it was a bunch of guessing. If anything you can see what the gameplay is like. Storywise I wouldn't think Atlus would spoil their own game in a demo. "

Kind of understandable, since PSN does charge for bandwidth usage on demoes. Kind of sucks, but demos aren't a huge deal that customers are complaining about (if there is a lack of demos) for Sony to change it.
 
I'm still surprised as to how much overseas coverage this game gets, however.

I played the demo and way loved it. I'm pretty optimistic about it coming out in the US though and if it doesn't, import =) Though a local translation would be much more appreciated.