What are some must-haves if I wanted to host my software's manual/docs online? Something that has an FAQ system, table of contents, that kind of thing. A free solution would be ideal, but I may be interested in a paid solution if it has the right features.
Note: This is for the end user of the software. I'm not looking for something to parse my source code.
not free but check out RoboHelp
I prefer to store the various pieces of information in a database and write a small script to generate HTML pages and a little app that generates PDF via a PDF library.
Often technical documentation can be structured in a unique way for the particular product and you can spend a lot of time getting it into existing documentation solutions.
With the info stored in a central location you can also easily put together a few interfaces for new information to be added.