Well, I'm a sentimental freak, so I'd probably go for:
The wall of pictures/frames (I count that as one, since I'd basically snatch them all while standing in one place, lol)
My Breyers (there's only three, but I just love them soooooo much, especially Ruffian and Big Ben). They're replaceable, though, so I might skip over them if the emergency actually happened.
My Big Ben poster, autographed by Ian Millar and Fred Stone
I also have a massive collection of VHS tapes from the horse races and show jumping competitions that I've taped, and I'd definitely want to take those. But I'd have to find a box first and throw them all in, and then run around finding the tapes that are scattered in various places (some upstairs, some downstairs, some in the pantry, some in a spare room, etc.). I also would want to save some of the stuff I have from my pets as babies (Jake's first collar has been peed on and pooped on by the cats, and thus smells horrible even though I've washed it several times, but I can't bear to throw it out). And, of course, the sentimental "shrine" stuff I have from Grizzly, a cat that disappeared some years ago, I would hate to leave that stuff behind.
Of course, if a disaster actually happens, I might find it's easy to just run for safety and forget everything. It depends on the severity of the disaster, though, lol (if things aren't falling down and crashing around me, I might try to salvage a thing or to, lol)