It is absolutely fabulous. I keep my Linux box, Mac and Win PC in sync. I also use it to keep a single copy of my dot files and share them between my mac and linux box (I use symlinks in home dir to point to Dropbox files). So far, pretty reliable.
Reading this article was the most interesting experience I have had in a long time. The passion and feel of the description and the imagery being described really resonated with my geeky soul. RIP SR-71. You are a truly magnificent creation.
This is a smart move. If news starts disappearing from Google, why would people use it at all! And, the fact that Google supports "opt-out", makes this all the more easy!
Please do a more detailed version, if it makes sense to do so. You actually managed to say a lot in this little space. I had a teacher too who did this on a small scale - the first 5 mins was a summary of the previous calls. The first day of each week he summarized the entire chapter or section in the first 10 mins. This bird's eye view of the material went a long way in keeping the concepts 'live',
I really like the effect of crowd-sourcing influence. This appears to be a fall out of the large number of comments to the recent post on HN regarding the slack on part of 37signals:
http://news.ycombinator.com/item?id=803899
I don't think you are crazy. Wishing you luck with what you want to do. Just make sure you post back your experiences on HN. Also, like someone suggested, blog about it regularly. Will be great to see whats going on with this idea on a daily basis!
Learn some version control and use it. Period. It saved my MTech thesis a couple of times. And that is something. Even if it is for just this one time, blindly take this advice. Will thank HN community later.
For those who don't know - Insynch.com is like dropbox. Only, it syncs with your own Google docs account.