Twitternotes lets you take notes anywhere and send them into your twitter account. You can also tag notes too!

Aruna URL is a URL shortening service that is accessible via several methods to make it super convenient. The most convenient we find is the yahoo widget. There is also, html widget, facebook, igoogle, browser bookmarks and an API for developers. Handy for twitter, SMS, MMS and any other message service where your message is limited in characters.

A tool to enter and manage your car mileage. See charts of your distance traveled over time, and compare it to your fuel economy. All in a nice, easy-to-read format. Twitter enabled.

A free service that connects your Twitter account to your Google Calendar. Add events in a snap from your favorite Twitter client.

What is it? - Inner Twitter asks what is in front of you? In answering you reconnect to your original happiness because to answer you must stop during your ordinary activities and turn your attention to immediate reality. Stopping releases the tension that builds up as you rush through the day. The effect of simply stopping can be profound.

How does it work? - A chime message is sent using Twitter (or Jaiku) at selected time intervals. When you receive the chime stop. Listen. Pay attention to your breathing. Pay attention to what is before you. Really look at what is in front of you. Forget yourself and become whatever resonates, like stillness, peace or beauty.

How do you sign up? - Become a follower of one of these Twitter (or Jaiku) users: mindful15, mindful1PerHour, mindful1PerDay. Then become a follower of user mindful. A chime is automatically sent every 15 minutes, randomly once an hour, or randomly once a day, depending on which user you follow.

Remember the Milk is a To Do list and manager which is now integrated with Twitter. Here is how to use it (from their web page)

"Getting started

If you're not already using Twitter, you'll need to sign up for an account. You'll also need to add rtm as your friend on Twitter (either by clicking the 'add' link on rtm's profile page, or sending the message 'follow rtm' to Twitter). Then, complete the quick and easy set up process in the box on the above right.
Interacting via direct messages

You can interact with Remember The Milk via direct messages on Twitter. To add a task to your account, just send your rtm friend a direct message with the name of the task. You can also send one of the commands listed below to do more with your tasks.

If you're sending a message to Twitter via SMS or IM or the web update box, remember to add d rtm before your task name or command to indicate that it's a direct message. For example:

d rtm pick up the milk

d rtm !complete call jimmy

(If you're sending the message through the direct message web page on Twitter, you can leave off the d rtm part.)
Command list

You can direct message the following commands to rtm. You may receive a confirmation or info back via a return direct message.
Adding tasks

pick up the milk adds a new task with the specified name to the Inbox

call jimmy at 5pm tomorrow adds a new task with the specified name and due date to the Inbox

return library books in 2 weeks adds a new task with the specified name and due date to the Inbox
Sending tasks

@username pick up the milk sends task to the specified Twitter username (this person must be set up with Remember The Milk too)
Updating tasks

!complete call jimmy completes the specified task (shortcut: !c)

!postpone call jimmy postpones the specified task (shortcut: !p)
Getting tasks

!today gets tasks due today (shortcut: !tod)

!tomorrow gets tasks due today (shortcut: !tom)

!getdue friday gets tasks due on the specified date (shortcut: !gd)

!getlist personal gets tasks from the specified list (shortcut: !gl)

!gettag call gets tasks with the specified tag (shortcut: !gt)

!getlocation office gets tasks at the specified location (shortcut: !go)
Setting up

!on enables task reminders

!off disables task reminders

!help gets help info

!tips gets a list of commands
Getting reminded

Once you're set up with Twitter, you can receive task reminders as direct messages to your Twitter account. These will be sent according to your general reminder preferences (more details on reminder settings are available in the Getting Started guide). To disable reminders on Twitter, send a direct message with !off to rtm, or toggle this option on the Remember The Milk 'Settings' screen under the 'Reminders' tab."