Desktop uploaders are available for both Windows and Mac OS X. Users of OSX 10.9 and up can download the application from the App Store, or directly from vzaar. Windows users (XP and later) can download the Windows uploader directly from vzaar.
You also have the ability to delete videos from your account. Whilst you are on the 'My Videos' screen, simply select the video(s) you wish to remove, then hit the delete key on your keyboard.
The 'Uploads' screen allows you to upload as many videos as you like. You can either drag and drop the files straight onto the application, or click the 'Upload' button at the bottom of the window to choose files from your hard drive. To select multiple files, hold down the cmd ⌘ key whilst clicking the videos. You can now choose a title, description and upload size for each video.
Additional Features in Mac OSX
Whilst uploading in OS X, a handy progress bar will appear in the top right corner of your Mac's menu bar so you can keep an eye on your upload's status while working in other applications.
Also, the Mac App's preferences (cmd ⌘ + ,) allow you to set your default upload size, and to customize the menu bar icon behaviour.
Note: the desktop uploader does not currently support custom upload sizes.