Writing software documentation is probably the most boring part of a project for a developer. However, having blogged during the development process makes it easier. I am able to take some blog entries and paste them into the help files with very little editing. Also, by continuously writing blog articles during the past months, it is easier to fight writer's block.
I am using the free Shalom Help Maker to generate a standard CHM-file, easily accessible from within FeedJournal. Writing the help files is instructive because it places you in the user's shoes, and any design flaw becomes much more apparent. However, I have been working hard to keep the application design simple, and I hope that it is intuitive enough for users, so that they will not need to resort to the help system.