Tweeteev is a free twitter application that allows you to have multiple accounts with a very slick interface. The focus of this application is UI and features.

You can download it on the Market here.

Multiple Accounts

This is the first screen you see when you load this up and you can easily choose between any of the twitter accounts you have registered with the application. Keep in mind though, it appears that only one twitter account may be active at a time, so you will not be getting tweets from each of these accounts when the application is running. The application is able to handle up to 10 accounts.

Home Screen

Tweeteev has a very clean interface with a cool color scheme and a nice little home screen when you enter in an account. Good design goes along way in mobile applications and while this one isn't perfect it is a good looking and functioning interface which is fun to use.

Timeline

The main timeline can be entered through the 'new tweets' option from Tweeteev's home screen. I especially the ability to check what application users were tweeting with from the timeline. I would say that the refresh button is hidden on the timeline ( its in the main menu > more). Really good presentation of tweets.