Personally, this is why I run my own web services using open source packages rather than trust free services for long-term storage of information (short-term usage is inevitable, but get that stuff off and onto a server you control and ensure it can be backed up ASAP).
The social bookmarking service Ma.gnolia reports that all of its user data was irretrievably lost in the Jan. 30 database crash that knocked the service offline. That means that users who were unable to recover their bookmarks through publicly available tools (including other social media sites and the Google cache) have lost all their data.
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It turns out that Ma.gnolia was pretty much a one-man operation, running on two Mac OS X servers and four Mac minis. A clear lesson for users is not to assume that online services have lots of staff, lots of servers and professional backups, and to keep your own copies of your data, especially on free services.