Foller.me has one of the easiest welcome pages imaginable. See the logo above? That is it outside of a small entry box where you type a Twitter id (a Twitter id is no longer just a person, but that is another post). What you get back is outstanding in a clean interface after it reads your last 200 tweets and 500 followers.
At the top is some very light images of others that were requested, just so you might roll your mouse over them and take a look. But then the information begins. I ran myself as normal. I got the bio information first. Followers, following, location, etc etc. How many tweets. All of that. The basics as you would imagine.
Next up was a listing of recent topics, not hashtags, but topics themselves. A great way to see more than the hashtag listings. If you select any recent topic listed it then uses Twitter search on that keyword to get you more results from the public stream.
As each section is collapsible to save screen real estate, the next section down is hashtags. It quickly gives a listing of all the recent hashtags. As you would expect, the larger the word the more frequently used.
Next up is recent mentions, meaning who that person has replied to or mentioned in their tweets. it is a good indicator of who that person interacts with. Each name is a link which then takes you to their Foller.Me profile, brilliant for keeping you not only on the site but also gives you the most information.
The last section currently only looks at 500 followers of that Twitter id, but it lays the followers across a Google mashup showing where they are and even gives some text on the bottom. Meaning of the 500 it scanned for me, there was 221 different locations with 14 invalid ones (meaning the person did not list a true or real city or place). You can click on any icon to get the name and location of the person.
NOTE: I think I forgot to mention the bookmarklet they have so you do not have to visit the site each and every time. A great time saver