Update June 7, 2007: Pixline has released a new version of the Upload+ plugin. Their changelog says that they added more options. You can also now download the plugin from the WordPress.org plugin page.

If you are building a site for clients based on WordPress, you want to make it as easy for them as possible to enter information without having to consider coding and other issues.

This plugin is great for those types of sites, as well as for anyone with a WordPress site who wants to have one less thing to think about. When a file is selected for uploading, this plugin changes the filename according to the following three rules:

  • only lowercase;
  • only alphanumeric [a-z] and digits;
  • convert spaces in underscores ( _ )

Plugin page on WordPress.org>>