Well, now we have one.
FileStork is a Dropbox add-on that lets you request files from co-workers, who can use the service's Web interface to upload files directly to your Dropbox account. You're the only one who needs a Dropbox account, and the folks you're requesting files from don't need to install or agree to anything. It's painless all around.
So, how big is big? You're limited to a maximum file size of 75MB, which is large, but not extremely so -- it won't fit the bill for very beefy media files, like video files and particularly large graphical comps. That said, the system is secure, reliable, and easy to use -- so if you need to get files from someone, FileStork is a compelling choice.
Of course, there are alternatives to FileStork, namely Airdropper -- though AirDropper has recently moved to a subscription model. FileStork, at least for now, is free and doesn't require any special registration (aside from allowing it to connect to your Dropbox account).
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