FavParser parses posts for external links and puts their favicon next to them.
Spotlight allows you to offer deals to your audience.
WP RSS Validator runs your RSS feed against the W3 RSS Validator and alerts you of any errors or warnings in a convenient dashboard widget.
Fast Secure Contact Form lets your visitors send you a quick e-mail message and blocks all common spammer tactics. Additionally, the plugin has a multi-form feature, optional extra fields, and an option to redirect visitors to any URL after the message is sent.
WPtouch automatically transforms your WordPress blog into an iPhone application-style theme, complete with ajax loading articles and effects, when viewed from an iPhone, iPod touch, Android, Opera Mini, Palm Pre, Samsung touch and BlackBerry Storm/Torch mobile devices.