This innovation by invoke looks very exciting and promising for Twitter power users and professionals. The platform has tons of customizable options for personalized tabs and functionality, making it easier for manage multiple Twitter accounts, tracking link traffic and brand/audience feedback. HootSuite 2.0 is currently free. Open an account is required. The company is analyzing plans for possible paid subscriptions. Go to HootSuite 2.0 | FAQ
Ow.ly Social Bar 2.0 is designed for sharing web content instantaneously with minimal effort using Twitter. This well-designed bar (collapsable) and user-friendly tool is a must-have for every websites and blogs for increase brand recognition.
Yes, it's currently free. Try it. For more info go to ow.ly Social Bar 2.0
Below are three screenshots of an actively opened Ow.ly Social Bar on top of a news web site that I stumbled upon.