Twitter.com has released a new interface based on two panes; one for the real time stream for tweets and one for the selected tweet, it's options and dialogue. [youtube rIpD7hfffQo]
This design is really closely related to the official Twitter iPad app:
But what gets me most is that both these designs are so very closely related to the Palm HP WebOS:
Jump into the video and really check out the WebOS cards interface model. How different is it from Twitter panes model?