It amazes me too. I hardly view Dropbox as a stalwart company. But good on them for hitting the jackpot in the short term. Amazon AWS, upon which Dropbox rel

It amazes me too. I hardly view Dropbox as a stalwart company. But good on them for hitting the jackpot in the short term. Amazon AWS, upon which Dropbox relies, is open to all, not just Dropbox. Even Xen, upon which Amazon relies, is open to all, not just Amazon. Things are still very primitive and there's ample room, and plenty of motivation (e.g. data privacy), for experimentation. Besides prgmr, who else is offering Xen-based "cloud" (=hosting)? Are there a wealth of Xen-based alternatives (that could support "Dropbox" like functionality)?