While early in it's development, Cardinal is a twitter client like no other. Cardinal features a unified view, where all statuses, direct messages, and mentions are in one single view, sorted by time or thread reply status.

Cardinal features filtering, where statuses and search strings/hashtags can be filtered into seperate groups, there are several built in and you can also define your own.

On Windows, Cardinal features SuperTweet, a global Alt+F9 Hotkey allowing you to stay in your current application to send a tweet. Snarl (global notifier) is also supported.

There is no dependencies on .NET, a Web Browser, Adobe AIR, Windows Presentation Foundation, Silverlight, et cetera. That said, Cardinal has low memory usage, compared to other clients, averaging around 25-30MB in usage studies.

Get Cardinal and take it for a spin to see what it can actually do for you!