Twitdone lets you tweet your tasks in an effort to help get you organized. You have a couple ways to interact with the site. Their web interface is the full management and the rest is done via Twitter from hashtags to direct messages.
I will immediately tell you this site had one of the best help screens, before you even log in. Every step was drawn out.
Once you log into the site, via oAuth, you are presented with a blank task area and a box to enter your task, in less than 140 characters.
You could also have sent a tweet with #todo and the system will pick that up or just direct message one to keep it private.
Once you have started forming a list of todo items, the web interface allows you to color code, mark done, archive (no undo for this) and even tweet the todo back out to your stream. For those that demand attention and color isn’t enough, you can even add a star to those items in your list.
I thought ok, so a web based todo list I interact with from Twitter. How do I remember I have these? TwitDone also includes a notification area to send alerts for specific tasks. It appeared to be email based only. I hope they soon allow direct message reminders to come back to you.
Lastly was the ability to search your to-do information. This can be handy if you have used the system for a while or if you just have a ton of crap that you never get done.
There is one automatic tweet that goes out when you sign up for the account, their way of promotion saying you are using the service. After that, they never post back to your stream or use your account (mainly since you are using oAuth and can remove them immediately).