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I'm In! is a new travel-planning site for groups, similar to Groople where the actual service revolves around actual groups. It starts you off with ideas and destinations, instead of hotel rates and airline availability. Now you can begin to plan a trip around things that matter to you and your group members. This concept is similar to a recently launched service called roadtrip wizard. If you've planned the trip, then you're the event planner, and serve as admin for the group. You can invite members, and they can contribute to much of the trip planning as well.
From adding activities, to suggesting dates, all group members have a pretty wide range of contributory options. The problem with this is that I'm In isn't set up like a wiki, so there's a lot of potential for overwriting information, without a history of who changed what, and when, outside of the group feed that appears on the homepage.
Actually, this overwriting option is a problem for several aspects of planning a trip on I'm In. Every time I add items to my itinerary, it overwrites what I already had, instead of integrating them or even alerting me to potential conflict. This is a problem for several reasons, as I'd begun planning a trip for Chicago, but was able to overwrite my itinerary with activities in New York. Yes, it would be silly for me to do such things, but web-based applications such as group trip planning should have enough automated tools to inform me of when I'm making conflicting plans.
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Another frustration I encountered with I'm In is the search tool. The only thing social about I'm In is the group you set up for yourself. It acts more like an evite invitation than a social network. Which is fine, but it limits the ability to learn from others' trip planning. Any search that you do for I'm In will present you with several sets of itineraries, which is helpful, but could be supplemented with individual activity ideas. This would limit the amount of time I spend searching, and toggling back an forth between itineraries and search results to make a tailored trip for my group.