Once the province of consumer-oriented photo sharing sites like Flickr, these sites let home office users and even mid-size companies do the storage and online collaboration thing on the cheap.
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You get 20 MB and a maximum of 50 files for free, as well as limited online tools. At $10 per gig of storage memory beyond the 20 MB, there are cheaper online options for storage. But the real value proposition here is the range of a la carte online