Tom at FoundHistory recently posted on the layoff of one of the architects of Flickr Commons, that incredibly useful source for materials from a number of major archives and museums. Tom sees this as a moment to discuss some of his own concerns about the promise and peril of using commercial sites like Yahoo, Flickr, Second Life, and others for publishing cultural and academic resources online.
This debate is one that I've had both internally with myself and externally with my colleagues for several years now. No one wants to think that the time, energy, money, and resources invested in placing something valuable online is just going to go away, but the benefits of a ready-made location and user base are also clear.
It seems to me this is about balancing the ability to reach more people, often with a more polished and supported interface, with the need to protect against the risks of commercial failure and potential loss of access to data. [Although we also need to remember that just because something is hosted on the servers of an educational or cultural institution doesn't mean it is always going to be there. "Forever" is a long time in the era of government budget cuts and rapid software change.]
Still, in the end for me it comes down to a question of whether or not an institution can get data placed in repositories like Flickr Commons back out with some relative ease (both technically and in terms of copyright).