Lets you set headers

Supports CloudFront

Panda makes it completely painless to implement full video uploading, encoding and streaming functionality to your web application in a matter of hours. Panda run's completely in the cloud computing environment provided by Amazon's array of web services. The application runs on a customised EC2 instance with everything pre-installed, including FFmpeg and an plethora of codecs. SimpleDB is used to store all of data for video, encoding, accounts and encoding profiles. Uploaded and encoded video files are then stored on S3.

Describes how to let 3rd parties upload files (using a regular form in a web browser) directly to your S3 account, with restrictions set by a signed policy document that you include in the form. Nicely done, Amazon.