I found
this. I'm not sure what version of phpMyAdmin that applies to.
--- edit ---
Here's the full description from the phpMyAdmin 2.4.0 manual:
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$cfg['UploadDir'] string The name of the directory, ending with a slash, where SQL files have been uploaded by other means than phpMyAdmin (for example, ftp). Those files are available under a drop-down box when you click the database name, then the SQL tab.
Please note that the file names must have the suffix ".sql".
This feature is useful when your file is too big to be uploaded via HTTP, or when file uploads are disabled in PHP.
Please note that if PHP is running in safe mode, this directory must be owned by the same user as the owner of the phpMyAdmin scripts.[/]