UPDATED: List MIAs v3.2
List MIAs v3.2 checks your entire iTunes library for missing and presumed dead tracksthose tracks that iTunes is unable to associate with a file and which are listed in iTunes with a "!"and displays them allowing you to delete them from iTunes or export a text file listing them by alleged File Path (if available), Song Name, Artist and Album, which you can view using TextEdit.
This latest version auto-saves the window and columns sizes (this is kind of awkward to do with Cocoa-AppleScript) and has other minor performance tweaks.
More information and download is here. If you use it and like it a donation would be greatly appreciated.