Yes...
This is my problem, I have no idea where these un-imported files are or I would just delete them. It says they aren't in the library ... and, to be honest, I am a little gun-shy about tinkering around without some help with anything in the library since the photos are pretty precious (though they are backed up)... and iphoto structure is pretty wacky to start with...
Agreed, iphoto structure is wacky!
If these pics are backed up, you've got nothin' to lose - go for it. You tell that software who's boss!
Go to the iphoto library files:
Users > (your user account) > Pictures > iPhoto library >
You should see folders labelled w/ the year of import (I think it's based on the computer's calendar, not the date of photo), then another set of numbered photos (is this the month of import?), then another inside that....
Anyways, eventually you get to the files themselves.
You have the data files in a folder, and then the picture jpg files. You should be able to see each jpg in the preview window (view these in the 'columns' view for quick jumping around).
Actually, if it shows you the picture in preview mode, chances are the files themselves are salvageable. What I'd do is trash the data files. You might try grabbing all the jpg files, moving them to a totally different spot, trash the data folder, trash the cryptically numbered folders, etc.
I do this sort of master-level file management all the time for iPhoto and its equally annoying partner iTunes!!