A few Months back – I was grousing about WebDav – like many people, I was trying to use Sakai/CTools to handle my Podcasts – which were usually 50-100MB. These files cannot be uploaded – but they can go in via webdav. Seth told me about Cyberduck for Mac OS/X from www.cyberduck.ch and I have been in heaven ever since. Cyberduck supports dav and sftp – and gives me book marks and drag/drop – all in all wonderful. And Cyberduck works wonderfully with Sakai.
I highly recommend Cyberduck to any Mac user using WebDav and Sakai (www.cyberduck.ch).