I had to abandon twitter for the sake of my productivity, and I generally think it's filled with a ton of unimportant noise. However, I'm a reasonable person who knows that some smart people will be able to make new and interesting apps that use the twitter API, and though I, personally, would probably not use this app, I'll just say what I think about your design. :)
It is clean and professional looking. I might add a more obvious frame around the content on the right that links it to the selected tweet on the left, but there's no reason you'd have to add a bunch of snazzy graphics. They'd only create clutter. I suppose you could go over to sitepoint or 99 designs to have a designer make you a fancy splash page/logo, but I bet you could getaway with a text splash, too.
Thanks for the comment. I'll definitely try to add some border around the frame (web view). I'm thinking some thing like a leafy effect would be nice (like the ipad mail app, if you have noticed) but i'll see what I can do.
It is clean and professional looking. I might add a more obvious frame around the content on the right that links it to the selected tweet on the left, but there's no reason you'd have to add a bunch of snazzy graphics. They'd only create clutter. I suppose you could go over to sitepoint or 99 designs to have a designer make you a fancy splash page/logo, but I bet you could getaway with a text splash, too.