Twitter is a great business tool. Every day, millions of people use Twitter to create, discover and share ideas with others. Now, people are turning to Twitter as an effective way to reach out to businesses, too.

Below are some of the best Twitter tools that people or professionals can use for their business
1) TweetDeck
TweetDeck is your personal browser for staying in touch with what’s happening now, connecting you with your contacts across Twitter, Facebook, My Space and more.

With TweetDeck, you can connect through multiple Twitter accounts as well as Facebook at the same time.
Supports both Mac OSX and Windows (XP/Vista).

2) Twitterhawk

TwitterHawk is a real time targeted marketing engine that will find people talking on twitter now by your chosen topic and location, allowing you to really hit your target mid conversation with ease.

It will periodically search twitter for you and either auto-reply or generate a list of matches for you to respond to or reject from your twitterhawk account.

3) CoTweet

CoTweet is a platform that helps companies reach and engage customers using Twitter.
CoTweet allows multiple people to communicate through corporate Twitter accounts and stay in sync while doing so.
Think of it as social CRM — with an emphasis on the “social”.

With CoTweet, you can:
Engage people throughout your company — Share the job of being on duty. Tap the collective wisdom of people across functional areas like marketing, PR and customer service. Assign tasks and track follow-ups.
Focus on the conversations that matter — Know when you need to jump in. Track your exchanges through simple case management. Schedule updates to make company announcements.
Keep your brand human — Automatically include signatures in your updates to identify who’s talking and keep conversations personal.

4) Twitterfeed

Twitterfeed offers a practical feed-to-Twitter transformation service.This free service will push the content of an RSS feed to Twitter, ping.fm and other micro-blogging services. Its only a three-step process to link-up your Twitter account and then to connect an RSS feed.

You can add multiple feeds, specify some feed parameters (e.g., the frequency of updates, pre-pended text, etc.) and once set up, updates posted to the feed will automatically appear on Twitter. Whenever a new update is detected the header and a link are posted to Twitter and the receptive masses will come calling.

5) Tvider

Tvider is a FREE service built around popular Micro Blogging service Twitter.
Tvider lets you share your pictures, videos and audio on Twitter,You can express more powerfully with your Pictures, Video or a Voice micro blog and hence enriches your communication.

Twitter is helping businesses serve customers. One of Twitter’s key benefits is that it gives you the chance to communicate casually with customers on their terms, creating friendly relationships along the way—tough for corporations to do in most other mediums.