Yeah, there was a pretty big campaign about it, actually. I used to have a full-page add for it that appeared in the Toronto Star newspaper. I remember wanting to go, but never did.

But does something being shown in Imax theaters automatically mean it was shot in a higher resolution than 1080p? Could they have done better than that back in 2001 or whatever? (I don't really know a ton about such things)

I've still only seen one Imax/Omnimax film so far: Ben Burtt's "Special Effects: Anything Can Happen." That was a while ago. :p Too bad we can't see it again.