Nathan Willis - Users care about data, not software:
"In working with graphics editors, desktop publishing apps, and Web-based content-management systems, I find almost none that can export to anything besides its native format, and none of them makes even that simple.
Some developers clearly do understand the importance of exporting the data. Every new release of Gnumeric, for example, highlights improvements in import and export filters for the Excel format. And Quicken compatibility is a top priority for GnuCash. So why is it that so many free software projects let data import and export functionality fall through the cracks?"