Cadmus is a real-time twitter service that displays tweets grouped nicely into appropriate chunks of time.

Similar posts are grouped into conversations and the most important one is placed at the top. Trending topics are calculated from within your group of friends thus giving more personalized trending topics compared to the general trending topics described by twitter.

@Replies are grouped into conversations. Cadmus uses twitter oAuth for authentication. Cadmus also has an API for other developers.

Quickie

• Manage tweets, view the most useful tweets
• Similar tweets grouped into one
• @replies grouped as conversations
• Tweets grouped according to time

Cadmus Says

Cadmus is a real-time service that manages your stream (Twitter, FriendFeed and RSS) by displaying the most relevant content since the last time you checked in. It helps you get caught up on what you have missed.

Web

• Cadmus – Manage your twitter stream

Follow

• 
  @thecadmus – Helping you figure out what your friends are talking about. Brought to you by @fanjiewang & @jayair.
• @fanjiewang – Entrepreneur. Founder of http://thecadmus.com
• @jayair – Entrepreneur, Designer and Thinker. Working on thecadmus.com – Trends from your friends.