Twitter founder Jack Dorsey is getting ready to embark on something new. His announcement came via Twitter, naturally. Dorsey got the tech world talking with his clever tweet, “Getting ready to embark on something new and entirely different. Excited!” And are we ever! Our friends over at Tech Crunch have some inside info on Dorsey’s next venture. According to Tech Crunch, Dorsey is working on a service that allows anyone with an iPhone to become a merchant. The idea is that this will allow any individual to take credit card payments on a mobile device, kind of like what PayPal does for the web. Interesting. What are your thoughts?