Although offtopic, because not DIY, the answer, for now, for me, is "Wuala". http://www.wuala.com/ High quality java software, all content fully encrypted, sophisticated neatly designed access rights management (cryptree). It's not open source, but otherwise really close to perfect. I am in no way associated with the company (originally "Caleido", now merged into "Lacie").

From the old article, Posted by timothy on Friday June 06 2008:
[...], which he used it to show [...]

Who the heck is IT the inventor of that strange kind of grammar ????