You can check out a What to bring
that I got from a friend and posted.
This is on my Middle Fork Wiki site. I started Wikis for my Middle Fork and Grand Canyon trips are wikis. You can check these out at Middle Fork 2010
and Grand Canyon 2011
. Feel free to use the Middle Fork wiki for reference. All I request is not to edit it as this is for my trip not all trips.
I haven't really done anything with the Grand Canyon one but the Middle Fork has all my planning in it. Anything that gets decided gets posted.
You can get a domain and hosting for cheap (I think mine was ~$70 for 5 years or something) and put mediawiki on it. Mediawiki is the same software that Wikipedia.org uses. My hosing company (dreamhost) actually installs it for me and I just have to make changes. Then you or anyone else (you can limit this to people you want) can edit and create pages.