I was actually thinking about this earlier today. If we have the legal and monetary backing, we may even have enough to take two entirely separate ideas and run with them both. I think it'd be a Startup Weekend first to start TWO companies in 54 hours...
Are you think of this as a "find a carpool" site, or as a some system that plans your trip and that of others as a kind of max-flow problem?
how about a web based chat service where you have the chat in one column and the most relevant wikipedia or new articles to the chat in real time. You could also imagine a desktop client which shows the most relevant emails and indexed files on the hard-disk.
There's definitely a lot of work that goes into it. You could even host in game pages, and set up web-services for reserving domain names. We could also create wordpress plugins, or embeddable page widgets (for igoogle, netvibes, and the like) to give content updates and clues.
How about a platform to help people organize and set up ARGs? (I like the idea of using rhino for this, cause a lot of people know javascript, and it's got the extensibility of java underneath, and new e4x integration). Anyways, you could give it a generic theme and a bunch of information you'd like to incorporate, and it can recommend articles, puzzles, locations, current events and other things to use as clues for creating the ARG.
It can then also have a player's companion for storing notes and doing research, with easy map mashups and such.
I really like this idea. Also, I'm familiar with rhino and have been doing a lot of development with it lately. Are we talking text based puzzle like games, or the click-to-poke style crap we're seeing all over facebook?
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