Josh, I had already checked the anonymous leads as I thought the values must exist SOMEWHERE in the database. That wasn't the case.
Adam, you know what is bizarre is, when I was normalizing the values last night, some of the 'junky' values were disappearing as I went along and normalized, and some where not. Couldn't figure out what was cuasing the ones to disappear though.
What I'm thinking at this point is to create the proper list of industry values and make them all have an asterisk in front of the value. That way, those will appear first on the list, and it would be unlikely that someone would enter an incorrect value with an asterisk at the beginning. It's a workaround for now anyways...