When we have many columns in a Data List which we've built, it would be very handy to be able to freeze a couple of columns (e.g., Lookup ID and Name) so that when we scroll across the columns, we can still see which record we're looking at.  This is an extremely useful function of spreadsheets.  We're trying to wean some of our staff off using spreadsheets and instead have them using Data Lists - such a feature would ease this transition.