This tool provides the same functionality that the Quick Base file attachment field provides BUT the data files are stored in Amazon S3 instead of Quick Base. You can maintain revision history, you can lock a file so others can't modify it while you have it "checked out".
I have been working with Juiced Technologies for the last seven months using the S3 Amazon link to store documents. This feature has allowed both vendors and internal employees to load required documents. This has reduced the number of emails being sent to be reduced and allowed the project to go all electronic.