You've heard about it from the halls of Congress, the stars of Hollywood, Comcast customer service and from the sales department of Dell computers. What do the world's best web marketers have to say about Twitter? Here are the posts that our readers have found to be the most useful this year -- so far.

• The Do's and Dont's of Promoting Your Business on Twitter (Sparkplugging) [5.42]
• What the Most Popular Brands on Twitter Are Doing Right (WebProNews) [3.33]
• 5 Ways To Find & Acquire Customers On Twitter (Shoemoney) [2.83]
• Five Tips In Building a Twitter Profile For Business (Social Media Optimization) [2.10]
• 10 Tips to Be Effective at Marketing on Twitter (TwiTip) [2.03]
• Twitter Drives Traffic, Sales: A Case Study (O'Reilly Radar) [1.99]
• Harness The Power Of Twitter For Local Marketing (Search Engine Land) [1.83]
• Tweeters Use Twitter For Business (Online Media Daily) [1.47]
• The Life and Times of A Twitter Link (Fuel Interactive) [1.17]
• 11 Ways to Find Brands & Companies on Twitter (Online Marketing Blog) [1.11]
• 10 Tips for Using Twitter And Email Marketing for B2B (Anything Goes) [0.86]
• Interesting Twitter Strategy from Chelsea Green Publishers (Chris Webb) [0.82]
• Using Adwords PPC to Get Twitter Followers. Smart? (David Risley) [0.48]
• Tracking Your Traffic From Twitter (eInfo) [0.41]
• Search for Twitter applications with Twtbase (Alt Search Engines) [0.21]
• Segmenting Twitter Traffic in Google Analytics (Conversion Counts) [0.17]

• Who Tweets? A Twitter Census (PC World) [2.06]
• 100 Twitter Tools to Help You Achieve All Your Goals (Online Best Colleges) [1.67]
• 5 Good Ways To Discover Twitter Applications (TechCrunch) [1.53]
• 20+ Great Twitter Tools for Firefox (Mashable) [0.94]
• Eight oddball Twitter utilities (Webware) [0.90]
• The 100 Most Popular Twitter Applications (Blending the Mix) [0.70]
• Twitterfriends gives you the stats on your Twitter network (Download Squad) [0.67]
• Top Twitter Tools to Check Out in 2009 (Socialble) [0.67]
• Find ‘Em On Twitter: 15 Twitter Directories Compared (Mashable) [0.66]
• Tracking Twitter Links: Twitter Analytics Tools & More (Get Elastic) [0.63]
• Too Much Noise On Twitter? Filttr Will Tell You What’s Worth Reading (TechCrunch) [0.60]
• 50 Twitter Tools and Tutorials For Designers and Developers (Smashing) [0.50]
• How to Use Twitterfall: Digg Spy for Tweets (Blogstorm) [0.50]
• Twitpay brings micropayments to Twitter (the social) [0.38]
• New Tools Add to Twitter's Networking Potential (Search Engine Guide) [0.38]
• TwitterFriends - Twitter Statistics Tool (eInfo) [0.33]
• TweepSearch allows keyword searches of Twitter profiles (Feeds) [0.25]
• eBay Founder Omidyar Launching New Startup Ginx, A Twitter-Based Sharing Tool (paidContent) [0.20]
• Twitter Launches People Search (Batelle) [0.19]
• Adjix introduces new way to advertise via Twitter 'Tweets' (Blog Herald) [0.17]
• Twisten.fm turns Twitter into a streaming music station (DownloadSquad) [0.14]
• Twitmatic turns Twitter into a TV channel (Webware) [0.11]
• Twitpay comes out of beta: send money via Twitter (Blog Herald) [0.11]
• Twitter Search Script Adds Real-Time Results to Google (Lifehacker) [0.11]
• Twitter Finally Integrates Its Real-Time Search Engine (ReadWriteWeb) [0.07]
• TwitteReader is like Google Reader for Twitter (Download Squad) [0.06]
• MicroPlaza: A Personalized Twitter Memetracker [0.05]

• 4 Annoying Twitter Myths (Scott Fox) [3.00]
• The 20 Words and Phrases That Will Get You the Most ReTweets (Dan Zarella) [2.83]
• 7 Ways to Be Worth Following on Twitter (TwiTip) [2.46]
• Kevin Rose: 10 Ways To Increase Your Twitter Followers (TechCrunch) [1.59]
• Finding the Tweet Spot - Top Tips for Building Twitter Relationships (PR 2.0) [1.45]
• HOW TO: Create Groups for Twitter (Mashable) [0.82]
• 5 Steps to Going Viral on Twitter (copyblogger) [0.80]
• The Science of ReTweets (Mashable) [0.76]
• Explore the Twitter Hashtag (Duct Tape Marketing) [0.66]
• Squidoo Release TwttrStrm - Organize and Archive Feedback from Your Followers (TwiTip) [0.16]