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cFTP allows you to create clients accounts with a very easy to use front end. Then you can upload as much files as you want under each account, with the ability to add a title and description to each one.
Log in, select the client, upload the file and then you can send him a link to a web page that contains your logo, and a sortable list of every file uploaded under his name, with description, time, date, and control over their deletion. It also works as a history of "sent" files. They can check the differences between versions, the time that it took to do that, and so on.
Additional benefits include saving hundreds of mb on email accounts since every file remains on your server until you decide to delete it, and they can be accessed from any browser anywhere.