@journtoolbox
Follow the Journalist's Toolbox on Twitter.
Mashable
A great guide to all things social media. A must-bookmark for Twitter users.
Twitter Guide for Skeptics and Newbies
Tailored to journalists, this guide from Columbia University Journalism Dean of Students Sree Sreenivathan gives you everything you need to know.
MuckRack.com
A huge directory of journalists on Twitter. A must-bookmark for journalists.
Search.Twitter.com
Twitter's version of Google.
BreakingTweets
Coverage of breaking news events and Twitter reaction from Craig Kanalley with the Huffington Post.
Hootsuite
Great Twitter management tool. Built-in link compressor, manage multiple accounts, schedule tweets for later, etc.
TweetDeck
Another great Twitter management tool.
Twitterfall
Great for chats, just type in a keyword and follow/participate in the discussion.
Monitter
As the name suggests, you can track three trending topics at once.
Convotrack
Track an entire conversation surrounding a blog post or Web page. Just enter the URL.
WeFollow
A Yellow Pages for Twitter.
FriendorFollow
Who are you following that's not following you back? Track it with this tool.
Twitterless
Tells you who has stopped following you.
TwitPic.com
Makes it easy to move mobile phone or desktop photos to Twitter.
Twitalyzer
Analytics for your social media. Graphics, other stats on how influential you are as a tweeter.
Klout .com
Another Twitter analytics site.
Twittergrader
Evaluates how influential you are on Twitter.
TwitterCounter
Track Twitter statistics.
Trendistic.com
Tracks Twitter trends.
TwitScoop
See what's trending on Twitter.
TweetBeep
Set up alerts to track certain keywords on Twitter.
Twittercal
Sync your Twitter account with your Google Calendar.
Twtvite
A Twitter invitation tool that helps you schedule tweet-ups.
Wordpress: Twitter Tools Plug-in
Mashable: 10 Twitter Tools to Organize Your Tweeps
Smashing Magazine: 99 Essential Twitter Tools and Applications
Everything You Ever Wanted to Know About Twitter
A great list of resources from Charles Curle Design.
Sociable Blog: 100 Twitter Tools
OpenJason: 100 Top Twitter Tools
27 Twitter Tools to Find and Manage Followers
Eight Tools to Filter Your Twitter Stream and News
RTDNA: Social Media Guidelines
Radio TV Digital News Association established guidelines for using Twitter and Facebook.
URL Shorteners
bit.ly
One of the more popular link compressors.
TinyURL
A popular link compressor that allows you to customize your compressed links.
Doiop.com
Choose a keyword to shorten your link to.
tr.im
Use cautiously, this site shut down for a short period in August 2009
Backgrounds
TwitterBackgrounds.com
Liven up your page with different designs and colors for your page. Easy-to-use. Many designs are free but some cost a small fee.
TwitRounds Free Twitter backgrounds
Twilk
Use your followers' icons to make your background.
Mobile Applications
For iPhone: Tweetie 2, Hootsuite or Simply Tweet in the iTunes store.
For BlackBerry: TwitterBerry.
