Increasing post max size and max upload limit to 1GB

You'll probably need to increase your max execution time as well to account for longer upload times with larger files. You may want to use something that will break uploads up in chunks instead though, like Plupload.

@jcurry:

You'll probably need to increase your max execution time as well to account for longer upload times with larger files.

You definitely will need to increase the timeout (unless all your clients have super fast connections – and even that may not help).