http://code.google.com/p/swfupload/
Features
Features
- Multiple File Selection
File Upload Progress
Custom Limits for File Size and Number of Uploads
Filter by File Type ie. *.jpg
File Queue
Customize the Browse Control
Flash 10 Support (Starting with Version 2.2.0)
Client-Side Image Resizing (JPG & PNG) (Starting with Version 2.5.0)