Twitter Groups allows you to tag your followers into different groups. Then you can send a message to those groups without needing to send the message to each person one at a time!
Todoist features a simple and intuitive interface that helps you get organized without getting in your way. You can also use keyboard shortcuts to achieve blazing efficiency.
WhoLinks2Me.com is an incredibly useful tool for finding out who links to your website or blog. With Snap Preview Anywhere, you can not only read who links to you, but see them as well!
Mashery, a new company that helps companies build, promote, support and manage access to Web services and data, today unveiled its platform of tools and services in advance of the Web 2.0 Conference in San Francisco.