I thought I'd start a thread on online writing tools.
I've got two examples that I'm currently using - Googledocs and a wiki.
I'm using Googledocs primarily for Freeform Games. Recently I've done some final editing of characters through it. I'm also starting to write out plots for one of our other games - in due course I'll create the characters as well.
Googledocs is very easy to use, and there are plenty of formatting options. Printing works very well. Version control is a bit trickier - I find that googledocs saves so many changes, it's hard to compare the right changes.
It's also easy to link between the different documents, so you could create a wiki-like feel to a freeform. If nothing else, I think a master index would be essential - and easy to set up.
Sharing is really easy. I wouldn't be surprised if, one day, I receive my character for a freeform as a googledoc.
As for wikis, so far I've just used them on my own! I've set up a wiki (here on wikidot.com) for The Village, and am slowly editing it in between other things.
Version control is excellent, but formatting isn't as powerful as googledocs. On the other hand, it's easy to add a forum, which is really useful for comments (not an option for googledocs). With just me working on it the forum for the wiki is a bit redundant!
Navigation around the wiki beats Googledocs as well. It's also easier to take my own backup - although you do lose all the formatting.
So, anyone else any thoughts?