This could become very useful: eyeOS.
I work at several computers and i have to save and carry my data on an USB stick. If you know the funny things different word-versions can do with a single .doc, you know how i love M$.
Webbased services are an alternative. I manage my emails with gmail and i use writely more and more.
But why should i use different services (gmail for mails, del.icio to bookmarking and writely to write), if i can have all that at my own server.
At the moment the functionality of eyeOS is to limited to do real work with it. But i has high potential for the future.
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