Twitter Trending and Popularity

• Tweet Grid - Provides a dashboard of Twitter searches that update in real time. Helps you monitor multiple topics at once.
• Twemes - View the most popular tagged tweets on Twitter.
• Twist - View trending topics in Twitter and what people are saying about them.
• TwitDir - A directory of Twitter users, with the option to search by different attributes, and also view the top 100 posters, updaters, favouriters, and followers.
• Twitscoop - Let's you view what's hot on Twitter right now. Also includes a Twitter search feature.
• Twitstat - Provides top 10 lists of various types of user activity on Twitter.
• Twitter Grader - Measures the relative power of a Twitter user name.
• TwitterFriends - Presents a quick snap-shot of who you most frequently reply to on Twitter and who most frequently replies to you.
• Twitterholic - Provides a list of the 100 best twitterers based on their followers, the people they follow and the number of their updates.
• Twitt(url)y - A service for tracking what URLs people are talking about as they talk about them on Twitter.
• Twopular - View trending topics on Twitter broken down by time periods.