MARC Report 238: Related Records
If you are interested in checking the records in your file against the versions of those records in the LC catalog, you will find the 'related Records' view invaluable.
Not only does this view automatically fetch matching records from LC as you navigate through your file, but it highlights the differences between your record and the DLC record in color!
In future versions we would like to expand this 'MARC Compare' technology to include more record sources.