For you to become a successful Twitter user and harness its viral power properly, you need to act smart and evaluate yourself to judge whether you are adopting the right strategies. You may be thinking that becoming a authority in Twitter requires a descent number of followers. While you are absolutely true, other factors such as your update frequency, reach, choice of topic, recommendations, etc. also needs to be considered.
Here are some web tools that calculate your popularity among other twiples and help you become a smart Twitter user:
Twitter Grader

Twitter Grader measures your Twitter influence considering various factors such as follower count, power of these followers, update frequency and volume of updates, etc. On a scale of 100 you are assigned a score that determines your Twitter popularity. Additionally this site also provides an elite list of twiples (based on ranking), top twitter countries, location, cities, US states. You need to be bit patient to know your score though!
Twitter Analyzer

Twitter Analyzer is a cool tool if you are looking to make a detailed analysis of your presence and influence at Twitter. It gives you a graphical representation of your popularity, reach, hashtag usage, your follower growth rate, density map, demographics, your mentions (@), groups and much much more. Very fast and really impressive.
twInfluence

twInfluence takes into account factors like reach, velocity, social capital and centralization and grades you.
Twitterholic

Twitterholic is a web app that assigns you rank based on the number of followers. You may also get a rank based on the location as also get the tags that are associated with you. This is a nice tool to measure the growth rate of a user with respect to a timeline.
Twitalyzer

Twitalyzer judges your influence, signal, generosity, velocity, clout and assigns a grade for each item. An overall grade is presented on a scale of 100 depending on the above factors.
TwitterScore

TwitterScore evaluates your Twitter popularity and assigns you a grade on a scale of 10. It also gives you a rank based on your score amongst all the users who have participated in Twitter so far.
Tweeple Rank

Based on the number of recommendations (tweets, bios, tags) Tweeple Rank assigns a rank which actually denotes your measure of popularity gained over time in Twitter.
TwitRank

TwitRank has a nice and clean interface and grades you on a scale of 10.
Klout

Klout assigns a Klout Score (K-Score) which is calculated on the basis of your engagement, reach, velocity, demand, etc. The score is based on a scale of 100. Higher the score higher is your Twitter influence.
Twitterank

Twitterank analyzes your incoming @replies and grades your ‘talkbacks’. A detailed explanation can be found about the functionality of this tool at the FAQ page.
Dis I miss anything? Off to bed now (its time for others to wake up actually)! Will love to listen to your feedbacks.
- @ramnath









Twitter Analyzer 404′d at my house. But thank you for the awesome list!