Sounds like some kind of corruption in that file.
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Open the file, then create a new document in CS3 too (ID3 is actually CS, CS3 = version 5 but that's another story...) and try moving the pages into the new document using the "Move Pages" command from the Pages panel. You may find you can move them all, or you may find that one or more pages is what is causing the corruption so when you move them the new document is corrupted also.
Thanks, i'll try this!
Error Code 3 is not a good sign...
Do you have an XP machine around? I don't know if it's an incompatibility problem, but ID 3 will probably run better on XP and maybe the export will work (and as far as I can tell, that's the best hope of actual recovery without going to Markzware). Markzware.com has a recovery service that you might want to try if the cost of reproducing the file would be more than a hundred dollars or so. See http://forums.adobe.com/message/3952952#3952952 for an update posted today on new fee structures, along with a link to send the file.
Since you can't export, try moving the pages into a new file and see if that one will export, or copy/paste everything to a new file if feasible, then try the export. You may also find you can export the stories to ID Tagged Text, which would at least allow you to place them again in CS5.5 as they are currently formatted, leaving a lot less work if you go the reconstruction route.
It also occurs to me that the problem could be a bad link, and hiding the links from ID might let you export, but this is only practical if the links are in one or two folders that you could rename.