How to optimize your PHP installation for large files?

Some resources on how to set up PHP, so that DOCman will allow large uploads:

• http://www.developershome.com/wap/wapUpload/wap_upload.asp?page=php2
• http://www.gen-x-design.com/archives/uploading-large-files-with-php
• http://www.radinks.com/upload/config.php