Commit to paperless for 2010. It makes sense in everyway: for the environment, for ease of referencing,retrieving and sharing information, for security. Set your marketing materials into PDF format and if they are in print, scan them.
The biggest investment of your time should be in the organization schema you create to keep information organized. There are several different ways to do this: by customer or client name is the obvious. General information that has more horizontaly relevency could be categories: travel, marketing, trends, research, etc. with sub files underneath:Travel - hotels, Marketing Plans -outreach, Trends -Social marketing, etc.
Of course, eliminating excess print requires one to stop printing everything – use the mobility tools available today to have data at your fingertips when you need it: not in your briefcase. Good luck!