TwitterMail - Get your own Twitter email address!

Twtcard - Send greeting cards, invitations or surprise messages here!

TwitWall - A great place to share your photos, videos, music. When 140 words just aren’t enough.

TwitBlocker - this is a great service for those who sometimes feel overwhelmed by constant tweetering by their friends. Politely quite them down here :).

Twitter Feed Simple. Post your RSS feeds to Twitter.

OutTwit Update your Twitter status and follow your friends in Microsoft Outlook without opening any other applications.