Like most people, at first I thought twitter was a load of rubbish – then people started developing applications around the concept and you can go crazy with it now – I am quite heavily into twitter nowadays.

Windows Twitter Clients

The best of the bunch is TweetDeck, perhaps the most popular professional Adobe Air client for Twitter. Supports, searches, groups, multiple accounts

CRM
If you are serious about doing business through twitter, you will most probably use some kind of CRM tool for Customer Relationship Management.

• CureCRM – Twitter and Email bases CRM
• Salesforce Service Cloud supports Twitter
• IGOpeople Twitter CRM business suite
• Microsoft Dynamics CRM offers a Twitter “accelerator” integration

Twitter User Directories
If just searching for someone isn’t enough for you to find people you could always use one of the directories that have sprung up.

• Twellow – Twitter “Yellow Pages”
• JustTweetIt is a clean and web directory with many users
• Geofollow – Location based Twitter directory covering the whole planet
• Twibes find people based on what they are interested in!

Enhancements to Twitter
Twitter has only very basic features, even Twitter clients offer only a few more. Since the Twitter API was released so people could make their own software to interface with Twitter there are literally thousands of tools.

• TwitterLocal allows you to address local Twitter users
• Social Oomph (formerly Tweet Later) is a tool with multiple features, some of clients some of extra tools, scheduling and automating tweets are just two of them
• PingFM allows to submit links to Twitter, Facebook and many other services at once

Other favorite of mine is Twitter Fall which makes for interesting viewing.