Excerpt from a Windows Live post; you can also download the full trial version of OneNote 2010 here
Your secret weapon – OneNote
Every group also gets its own OneNote notebook on SkyDrive, with different sections and pages just like a regular notebook. Your group’s online notebook is useful for collecting information from members and for storing centralized resources. You can copy in links, images, maps, and random notes, and rearrange them on the page as you get things organized. It’s great for brainstorming with others as you plan your trip, because you can each add your own notes and ideas to the notebook in real time, without fear of overwriting anyone else’s notes In other words, it’s a great companion to trip planning.