Twitter

Twitter
http://twitter.com

Email Notifications
Tutorial: How to receive Twitter updates in your Email - http://www.feedmyinbox.com/listings/tutorials/twitter-account-updates-in-your-email/
 * "Twitter is a great way to stay connected to people and companies you find interesting. But if you don't have an account or use Twitter very often, it would be convenient to get updates in your email inbox. With Feed My Inbox this is easy!"

Twitter + Email: Tweet via Email, Twitter Email Alerts, Twitter Notifications - http://tweetymail.com/

Twitter alerts via email by Twilert - http://www.twilert.com/
 * "Twilert is a free Web app that enables you to receive regular email updates of tweets containing your brand, product, service... well, any keyword you like really!"

Are Twitter’s New Email Notifications Cluttering Up Your Inbox? Here’s How To Turn Them Off - AllTwitter - http://www.mediabistro.com/alltwitter/twitter-email-notifications-spam_b9308

Twitter Alerts - TweetBeep.com - http://tweetbeep.com/
 * "If you love Twitter, you'll love TweetBeep! Keep track of conversations that mention you, your products, your company, anything, with hourly updates! You can even keep track of who's tweeting your website or blog, even if they use a shortened URL (like bit.ly or tinyurl.com)."

Account Creation

 * Full Name
 * Username (15 characters max)
 * Password
 * Email
 * Let others find by email
 * Inside Scoop
 * CAPTCHA

Development
Twitter Developers Documentation - https://dev.twitter.com/docs