Tramline is an upload and download accelerator that plugs into Apache. Its aim is to make downloading and uploading large media to an application server (i.e. Zope) easy and fast, without overloading the application server with large amounts of binary data.
Since Zope has a built-in WebDAV server, one can upload large media files into a Plone site, by mounting the Plone site as a WebDAV share. MacOSX and Windows both provide native WebDAV clients, but unfortunately both of them poorly implement the WebDAV RFC, and therefore Zope has problems with them.
For Windows, the solution is to use a 3rd party product - Netdrive, a free product from Novell is recommended. For MacOSX, there is Goliath. The native OSX webdav client sends the resource fork which Zope interprets as a separate file, so you end up with files that begin with ._ and .DS_Store littering your Plone site.
Sidnei made some patches to ignore the resource fork info, but for some reason these patches were removed.
Tomcom has also released WebDAV Content Item Filter patch which hides non-content objects from being listed in WebDAV.
PloneJUpload is a plone product that allows JUpload applet to interface with Plone. It adds an 'Upload Files' folder tab which shows the applet. You add files to be uploaded which are queued up. When you press the 'Upload' button they are uploaded into your Plone site all at once. The applet shows a progress bar so you can see how far along the upload process is.
The PloneJUpload product works pretty well, but there are a few minor issues which can probably be easily fixed during the sprint.
PloneJUpload support for the PloneMultimedia suite of products is issue #210 in the Plone4Artists tracker.
Upload from remote location
Many users may have already uploaded large media files (MP3, .mov) to another server on the Internet. Now they want to get those same files into their Plone site. Rather than requiring them to upload from their local computer, it would be nice to provide a feature to fetch the file from a remote URL.
Remote uploads of multimedia content is issue #79 in the Plone4Artists tracker.