The latest version of Gears introduces some new features that make manipulating large files so much easier.
Gears now makes uploading large and multiple files on the web much easier, giving you the primitives to roll a resumable uploader, which means hopefully we can see custom desktop uploaders go away soon. (...) Another cool new feature is the Blob API. Unlike strings, blobs let you reference arbitrary binary data — a first for JavaScript! Therefore, blobs can more naturally represent things like files and images, and they can be passed around efficiently. (...) We have also extended the Desktop API with a new method, openFiles(), which allows users to select multiple files of a particular content type, and then returns them as blobs for easy uploading or worker processing.
The multi-video uploader is useful if you want to upload more than one video from a single video and if some of your videos have more than 100 MB. "Each video can be up to 10 minutes in length and up to 1GB in size. These videos will be available in My Videos after they have finished processing. It may take 30 minutes or more for extremely large files to appear on your My Videos page."
{ Thanks, Hebbet. }