Please note that this plugin is no longer supported as Leopard does not support the API it uses anymore.
The Finder in OS X has a bug. It cannot show where the original of an alias was, if it cannot find the original itself. Be it because you just copied everything to a different computer, or because you discovered this 7 year old alias that doesn't point to anywhere now.
Now this is extremely annoying, cause this information is very useful if you want to locate the missing original yourself.
Which is where Broken Alias CM comes into play. With it you can simply copy either the filename or the complete path of the former original to the clipboard.