most popular twitter clients for iPhone?

I’m starting to use Twitter more, and so I was curious: which Twitter clients have found favor on the iPhone?  Given the excitement over the new iPhone, I decided to mine some information to find out.  Caveat: I don’t pretend that this is scientific, merely indicative.

On Twitter, I did a search for “iPhone line” and was rewarded with many tweets from people standing in line waiting for the new iPhone, reporting on lines of people waiting for the new iPhone, or (often) deriding people who even contemplated getting an iPhone.  I gathered 380 tweets, extracted all the lines that read “nn seconds ago from client_name” and tallied them by client_name.  Results after the jump:

Five concise questions for the entrepreneur

I’ve been contemplating the questions that concisely define a business.  These questions aren’t quantitative and are no substitute for a business plan, but any entrepreneur (or any executive, for that matter) should be able to answer them confidently and without equivocation:

1. Who are you customers?  (or, how do you know whether or not someone is your customer?)
2. What products/services do you sell?
3. Why does the customer buy your product/service rather than making/doing it themselves or buying it from someone else?
4. How does your business generate a positive cash flow?
5. How does your business generate value beyond revenue from sales?

So, gentle reader: what essential question would you add to this list?