I like the fact that you are thinking outside the box. Only problem is that so far the three ideas you have submitted don't capture the feel I am looking for. Think Google but for PDF documents instead of websites. Imagine your mother trying to use the site. The logo should be as friendly to the non-techie as it is to the techie or business professional. It has to have a universal appeal.
You sould have more time to keep trying as I am likely to extend the contest. Thanks for your submissions.