I installed plupload libraries in Drupal 7.x. Plupload is a highly usable upload handler for any CMS or similar. Plupload functions well if uploadprogress module is installed and enabled in PHP, though it will still function without it.
Ubuntu 11.10 installation
Install PECL uploadprogress
sudo pecl install uploadprogress
sudo vim /etc/php5/apache2/php.ini
and append the following:
sudo service apache2 restart