There are too many useless twitter apps but maybe twitter will start a trend of "textual interface applications". I am personally working on one and there's a lot of reluctance about that kind of interface but if a "mainstream" player can help... I'm happy to have one more useless twitter app.
What a bad idea. Please, no one register with them. I say this only for security concerns, nothing against them. You're going to directly link your credit card info with your twitter account...