A lot of people here seem to use Dropbox. In case you missed this, you might want to carefully read over the changes they just made to their TOS. Included in the changes:
http://blog.dropbox.com/?p=846
By submitting your stuff to the Services, you grant us (and those we work with to provide the Services) worldwide, non-exclusive, royalty-free, sublicenseable rights to use, copy, distribute, prepare derivative works (such as translations or format conversions) of, perform, or publicly display that stuff to the extent we think it necessary for the Service.
http://blog.dropbox.com/?p=846
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