Here's a little Christmas present for everyone! I just pushed out a new build of SlickUpload with samples of uploading to Amazon S3 (.NET 2.0 only). The samples use Affirma's excellent ThreeSharp library to connect to S3, which makes the whole process very simple. Pop in your Amazon credentials and the name of the bucket to write to, and you're good to go.
You can get the sample by downloading the latest SlickUpload distribution from the SlickUpload download page.