WordPress Plugins Database

This plugin works by scanning for the appearance of text within plugins and themes that may indicate compatibility problems.

It currently looks for the following:

Use of the old category tables that are now gone.
Use of wp-admin/upgrade-functions.php, which has been moved and renamed.
Use of the get_the_title function, which works a little differently.
Use of deprecated permalink functions, which still work for now but should be replaced.
Each of these conditions comes from discussions on the wp-testers mailing list and various blog posts during the time leading up to the WordPress 2.3 release. More details are shown at the bottom of the report.