Uploading directly to S3 will possibly be slower than writing the file to disk. So your server process will be tied up during the duration of the upload. As a result all other users of your site will feel the slowness. If an S3 error occurs, users will be see an XML based error page [...]
Today I bought the Motorola Droid phone and after a few hours of playing around with it, realized that SmartPhones suck at being used as a phone . They have fancy features and Internet access and what have you, but with my old (not-so-smart) phone, I could dial a number that I was used to [...]