I've found that Google Desktop is a convenient way of storing and accessing "rough drafts" of the material I produce for clients. Google Desktop turns your hard drive into a repository of information that's as easily and quickly searchable as the world wide web.
Most of the analysis, reports, strategic recommendations, and requirements work I do for clients initially comes in bits and pieces. These bits and pieces are distributed in small Word documents, Excel spreadsheets, and, above all, e-mails.
When it comes time to put together the more formal materials for my clients, I use Google Desktop to locate the bits and pieces that combine to form the larger documents. It's fairly easy to take pre-existing templates and fill in content from the e-mails and other notes interspersed throughout my hard drive.