Just a quick entry to mark how I managed to get the upload progress bar working for Imagefield
I had to install make and development tools on my Ubuntu Server.
sudo apt-get install php5-dev make sudo pecl install uploadprogress
 Any more problems, I have found this, which might also help freestylesystems.co.uk/blog/installng-pecl-uploadprogress-extension-drupal-filefield-module. Hope it helps