I have already asked on javascript/flash libraries for upload, which can make upload of larger files comfortable. However, there are limits which can disable the upload of larger files (PHP settings like upload_max_filesize, post_max_size, max_input_time etc.), which are sometimes given by your hosting provider.
Are there any libraries that can chunk (split) the file automatically before upload?
EDIT: found a note in another question: "So if you need to send truly large file I would say multiple posts with "transfer-encoding: chunked" (i.e chunked upload) is the way to go."