Some Wordpress plugins are often updated, which is good think. Plugins that are updated are 100% compatible with last Wordpress version and they also are the most secure possible. A plugin that has not been updated for a long time might not work with last Wordpress version and might create a security breach for you website.
Google Custom Search plugin for Wordpress replaces the default search engine with Google's Custom Search for websites.
Create list of items and display random item. Random quotes, or replace "Joe said" with "Joe said/commented/wrote/thought"...
Your feed, on steroids : add a custom footer to RSS items with, for example, a copyright notice, a "Read More (400 words)" links, an "A …
Extremely simple mechanism for embedding FirePHP into WordPress to use FirePHP during WP Development.
A widget for displaying a list of subpage links. The list remains consistent regardless of where you are in the hierarchy.
Logs the IP of the user when they register a new account. View the signup IP by going to the Users menu or by editing that user.