Wordpress Plugins
AskApache Password Protect Plugin
Wordpress Download Manager Plugin Drain Hole
Drain Hole is a centralized download manager, with full monitoring and statistics, versioning, SVN support, and SEO download URLs (no more nasty query strings!).
Search Meter
Search Meter is a WordPress plugin that helps you keep your blog focused on what your visitors want to read. It does this by keeping track of what your visitors are searching for.