I've set my default and header font settings a few times from the default Times New Roman to Verdana, and each time, Writer forgets my settings when I open it on another computer. I haven't found any documentation on this.
update: I saved my settings from computer to computer by going to Tools -> Options -> OpenOffice.org Writer and -> Basic Fonts (Western) and just making them all Verdana and decreasing their size by one since Verdana is roughly about a size bigger than most other common fonts such as Times New Roman and especially Arial.