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Over on Ajaxian Dion Almaer posted about SWFUpload, which is a small Javascript/Flash library that is a great improvement in the way file uploads work online.

Created by Lars Huring and his team, SWFUpload recplaces the contents of a div with a small transparent flash file that takes care of all the upload and frontend, Javascript is used for configuration and callbacks, HTML/CSS is there for styling and looks.

Not only is the experience better than most file uploads, there are also a number of added features:

• You can specify which file types are to be displayed in the upload dialog box.
• Multiple files can be uploaded by using CTRL/SHIFT+Click to select them.
• Trigger Javascript functions at the start, cancel, progress and complete stages.
• Get the file information and size before the upload even starts.
• Style upload buttons any way that you want
• No page reloads meaning you can display the uploaded files as soon as they are finished.

The one feature that I think is great (which is why it’s not in a bullet) is that SWFUpload will gracefully degrade to a normal HTML upload form if Flash or Javascript isn’t available.