You advice is kind. .IM is a not a new ccTLD in the domain name market. But it is not so popular till now. It is good that along with Twitter becoming hot. R.im is so good a short url service. I believe that the market for .IM will be more important in 2 years. I got tweets.im and track.im.
You've got the good keyword in the domain, however I don't know of many people who actively search for .im websites. In fact, If I saw a .im domain I'd be reluctant to click on it.
I have clicked om .im sites without being freaked out. If Twitter buys Tweeter.com I would think the domain would be worth more.
Well u can use a script to start url short site perhaps we can setup for you like this http://shrink.im/
.im are not that good they will be soon @talas nice domains lucky you my paypal got limited when name.com started selling .im domains :-S had to wait about 1-2 weeks to start buying but i bought nice ones ;D