I don't know if you can get them to upload to a WebDAV server, but if you can then I'd recommend http://bingodisk.com http://bingodisk.com I pay $29/yr for 15G

I don't know if you can get them to upload to a WebDAV server, but if you can then I'd recommend http://bingodisk.com http://bingodisk.com I pay $29/yr for 15GB space and unmetered bandwidth.