Top tip for working with the INFORMATION_SCHEMA views: use Excel to view them.
In Excel, go to Data, Import External Data..., then either Import Data or New Database Query. Use or create a DSN and fish out the INFORMATION_SCHEMA view that your interested in. COLUMNS is the one I use the most.
Then use Excel's Autofilter and you got yourself a Data Dictionary that you can filter to find, say, all fields with the same name, all fields of the same datatype (use char instead of nchar and have a feeling you've done it somewhere else too?), or whatever.