I’ve installed and activated the plugins listed below. Thanks to Daniel Bachhuber for the idea to list all these on a dedicated page. Also, thanks to Andrew Nacin for pointing me to the WP-PluginsUsed plugin.
Akismet 2.5.5
» Automattic (url)
Used by millions, Akismet is quite possibly the best way in the world to protect your blog from comment and trackback spam. It keeps your site protected from spam even while you sleep. To get started: 1) Click the “Activate” link to the left of this description, 2) Sign up for an Akismet API key, and 3) Go to your Akismet configuration page, and save your API key.
Configure SMTP 3.1
» Scott Reilly (url)
Configure SMTP mailing in WordPress, including support for sending e-mail via SSL/TLS (such as GMail).
Google Analyticator 6.2
» Ronald Heft (url)
Adds the necessary JavaScript code to enable Google’s Analytics. After enabling this plugin visit the settings page and enter your Google Analytics’ UID and enable logging.
Google XML Sitemaps 3.2.6
» Arne Brachhold (url)
This plugin will generate a special XML sitemap which will help search engines like Google, Yahoo, Bing and Ask.com to better index your blog.
HL Twitter 2011.7.30
» Luke Lanchester (url)
Pulls in all tweets and optionally sends new tweets
Jetpack by WordPress.com 1.2.2
» Automattic (url)
Bring the power of the WordPress.com cloud to your self-hosted WordPress. Jetpack enables you to connect your blog to a WordPress.com account to use the powerful features normally only available to WordPress.com users.
Login LockDown v1.5
» Michael VanDeMar (url)
Adds some extra security to WordPress by restricting the rate at which failed logins can be re-attempted from a given IP range. Distributed through Bad Neighborhood.
Search Meter 2.8
» Bennett McElwee (url)
Keeps track of what your visitors are searching for. After you have activated this plugin, you can check the Search Meter section in the Dashboard to see what your visitors are searching for on your blog.
Subscribe To Comments 2.1.2
» Mark Jaquith (url)
Allows readers to receive notifications of new comments that are posted to an entry. Based on version 1 from Scriptygoddess
Tumblr Importer 0.5
» wordpressdotorg (url)
Import posts from a Tumblr blog.
Ultimate Category Excluder 0.8
» Michael Clark (url)
Easily exclude categories from your front page, feeds, and archives.
WordPress Database Backup 2.2.3
» Austin Matzko (url)
On-demand backup of your WordPress database. Navigate to Tools → Backup to get started.
WordPress Related Posts 1.2
» Denis (url)
Generate a related posts list via tags of WordPress
WP-PluginsUsed 1.50
» Lester 'GaMerZ' Chan (url)
Display WordPress plugins that you currently have (both active and inactive) onto a post/page.