Dropping Columns

How nasty would dropping columns be?

I've just now started going through the source and am trying to find where 
it would fit in... if it could be done without a nightmare.

Any pointers?
-
- Thomas Swan
- Graduate Student  - Computer Science
- The University of Mississippi
-
- "People can be categorized into two fundamental
- groups, those that divide people into two groups
- and those that don't."