I finally chose the writing tools I'm going to use to publish my eBooks on personal finance -- Sun's Open Office, a free tool that is every bit as good, if not better, than Microsoft Office. It's far superior to all the online applications that I tried, too, like Google Documents and Zoho Writer.

I use box.net to store all my stuff online, download it to edit it, and upload the new version so I can work on it from anywhere.

Open Office works on my PC and Mac, though the Mac version is a little weird to install (hint: Install the English version of Aqua).