File Uploader can be used to upload multiple files simultaneously with progress indicator. Files can be added using drag & drop or with the standard file selection dialog.
An all-in-one solution, no programming or separate form required.
You can download the new extension via the Extension Manager (Menu->Tools->Extension Manager->Available).
Please read the help!
Note: this extension does not include support. I did create this extension for my own use, but thought it might be useful for other users as well. It is provided 'AS IS".