One of the cooler things we've put in place the past month or so has been the Gothic Greyhawk campaign wiki. I had asked for recommendations some time back, and folks suggested a few platforms - we started playing around with the free version of Obsidian Portal.
I wasn't interested in posting backgrounds, NPCs, and using the wiki to organize the DM's content - the typical stuff (I use OneNote on the laptop). Instead, we've been using it to keep track of the group's public information - their expedition equipment and gear, treasury, list of magic items and resources, that kind of stuff. This has been a huge advantage for enabling player planning. Take the list of scrolls, for instance. In between game sessions, anyone in the campaign can peruse the list of scrolls and see what's in the group's arsenal. Ditto with the magic items. My players wouldn't have been nearly as successful in some of the recent knock-down fights without the ability to collectively discuss the resource pool and brainstorm in between sessions on how to deploy their resources.
They've even taken to bringing tablets so they can pop out to the wiki if necessary and look stuff up.
There's also a body of standard procedures that always gets written down and lost - marching orders, overnight watches, standard memorized spells. Putting those things on the wiki and defaulting to the standard procedure has also stream lined play and maximized table time. I dislike spending game time on stuff that you should be able to write down once, and just reference and update.
It's still a work in progress, but you can see what we've done with the wiki here:
Gothic Greyhawk on Obsidian Portal
List of Magic Items
List of Scrolls
*Smitty, one of the players, put together that nifty Gothic Greyhawk banner. Thanks man!