Q: "How should I organize my Data Loader files?"

A: If you can spare one hundred seconds, check this out: http://tinyurl.com/OrganizingLoadFiles.

If you like it, and can spare more than one hundred seconds, I encourage you to watch the whole presentation Brian Wiebe and I gave at last year's Dreamforce: http://tinyurl.com/DataDoneRight3.

You can also download the script and slides here: http://tinyurl.com/DataDoneRight.