On the BitFlux blog today, Christian Stocker talks about the patch for PHP that allows for a simple progress meter when files are uploading.
Showing a real progress bar when uploading large files is an often requested (and quite informative) feature, which is not easily doable with the way the upload handling works in PHP. There is a patch available for PHP 4.4 and 5.0, which made it nevertheless possible, but some php core files itself needed to be patched for that.
He notes, however, that a new sort of patch for the same thing has just been committed to the PHP_5_2 branch, making the previous patch a thing of the past. It's completely new and you can check out the code here or the svnweb here.