Summary: there are several twitter clients. Some show more information and some show less, but you can easily switch between them!<p>I still don't understand why this and other articles from that site (daringfireball) are popular.
Someone once said "Twitter clients are the 'hello world' of Web 2.0"<p>(or something along those lines. I forget who)<p>edit: well, lots of people have said it, actually: <a href="http://www.google.com/search?q=%22twitter+client%22+%22hello+world%22" rel="nofollow">http://www.google.com/search?q=%22twitter+client%22+%22hello...</a>
A concept I took from the article was how interesting it is to see what people come up with using the API of what is at heart a simple service. I may be bias as this is my personal view of course :)