Now that you know Twitter is a powerful marketing tool, it’s time to get familiar. Heres 89 tools, articles, and resources sorted into categories. Use these to create a powerful Twitter following, and increase the visibility of your brand.

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Twitter 101:      
1. The Big Juicy Twitter Guide
2. Twictionary – A dictionary for Twitter.
3. TwitDir – Another Twitter directory.
4. The Twitter Blog
5. Explore Twitter

Twitter Media:

6. TweetPic
7. Twitxr
8. Twittershare
9. SnapTweet – Send Flickr photos to Twitter.  
10. Twiddeo – Twitter plus video.
11. TwitterGram – Share audio.
12. TwitSay – Give your Twitter account a voice.

Twitter Stats:

13. TweetBurner – Track what happens with the links you share.
14. Twitt(url)y – Tracks what URLs Twitter users are talking about.
15. Twitter Charts
16. Twitstat
17. TweetStats
18. TwitterBuzz – What people are linking to.
19. Twittermeter
20. Tweet Volume – Enter words or phrases and see how often they appear on Twitter.
21. Twitter Vision  
22. Twitterholic

Friends & Followers:

23. FriendFeed – Discover what your friends are sharing.
24. Twitter Karma
25. TweetWheel – Find out which of your Twitter friends know each other.
26. Who Should I Follow? – Twitter Friend Recommendations.
27. Intwition
28. CrowdStatus – Create a crowd.
29. My Tweeple
30. GroupTweet
31. Twitter 100
32. Quotably – Follow Twitter conversations.
33. TwitterLocal
34. TwitterVerse
35. Twemes – Twitter memes.
36. Tweetmeme
37. TwitterWho – Batch people search.

Spam Protection:

38. The Twitter Blacklist
39. Twitter Twerp Scan
40. Twitter Snooze

Twitter Organization:

41. Socialthing
42. Twittercal – Tweet your Google calendar.
43. Twitter Digest
44. Twitku – Read posts on Twitter, Jaiku and Pownce.
45. Twitter Timer – Set an alarm for things you need to remember.
46. Twitt.icio.us – Send links from Twitter to del.icio.us.
47. Twitter Where

Twitter Tools:

48. Summize – Search Twitter in real time.
49. Twitter Search – A customized search engine for Twitter.
50. YouTwit
51. TwittEarth  
52. Twhirl – A desktop client for Twitter.
53. Snitter – Desktop client for Mac and Windows.
54. Twitterific – Desktop client for Mac.
55. gTwitter – Desktop client for Linux.
56. Witty – Desktop client for Vista.
57. Twitteroo – Desktop client for the PC.
58. TwitterPod – Desktop client for Mac.
59. Twitux – Desktop client for Gnome.
60. Twitterberry – Mobile client for Blackberry.
61. Email Twitter – Mobile client.
62. Twoble – Mobile client for Windows Mobile Pocket PCs.

Twitter for Email:

63. TwitterMail
64. OutTwit

Twitter IM:

65. TwitterIM

Twitter Widgets:

66. Twitter Opera Widget
67. Twitter Widget
68. Twadget

Other Twitter Articles + Resources

69. How To Find Your Target Audience on Twitter – SmmGuru
70. Twitter Is A Tool! You Might As Well Use It – SmmGuru
71. Easy Way To Get More Twitter Followers From Your Blog – SmmGuru
72. How Does Twitter Define Spam – SmmGuru
73. 7 Tips For New Twitter Accounts – SmmGuru
74. Tweeting for Companies 101 – HorsePigCow
75. 5 Tips to Grow Your Twitter Presence – ProBlogger
76. 13 Odd Ways to Use Twitter – Social Media Trader
77. Twitter Feeds Made Simple – ClickPopMedia
78. Video: Twitter in Plain English – Common Craft
79. How to Use Twitter to Build Brand Integrity – Marketing Vox
80. Twitter and Business: The Conclusion – Business and Blogging
81. How We Use Twitter for Journalism – ReadWriteWeb
82. 10 Things Twitter Users Should Not Do – Valley Wag
83. Twitter Hashtags and Groups – American Pai
84. 8 Awesome Firefox Plugins for Twitter – Mashable
85. 10 Ways Twitter Can Boost Your Social News Profile – ReadWriteWeb
86. Copyright and Twitter – Blog Herald
87. My Essential Twitter Tools – Web-Strategist.com
88. Twitter May Not Have to Worry About Uptime Anymore – TechCrunch
89. Why Decentralizing Twitter is so Important – Scripting.com