Twitzap - yet another alternative interface for Twitter. This one has real-time tweets and saved searches which the regular Twitter now also has.
Tweefind - a Twitter search engine based on relevance ranking. Basically a Google-type Twitter search engine.
Rank based on:
# of tweets
# of RT he/she receives
# of replies
# of distinct users who reply
# of distinct users who retweet
# of RT he/she makes
# of links the user shares
See mashable for more.
Once you join, you can use a type of tag in your tweet with a number value next to it
eg The Shake Shack burger was worth the 83 minute wait. *food 9*
This gets plotted on a graph, here’s an example user.