Tweetbot for Mac - Public Alpha
tapbots.com
tapbots.com
This is purely speculative, I admit.
I read it by proxy prismatic, and news.me. And I mainly use it to post - for those who do read twitter, to the widget on my blog, and to Facebook.
I suspect that a replacement twitter could handle the last 2 use cases fine - which are the main point for me.
Could also be related to Mountain Lion having Twitter integration all over the place. Seems like that would render all the hours of dev time to create this program pointless unless they can release early and get some market share before ML.
Also supports a "mini" tweet view which makes it work more like an email client. http://yfrog.com/oerabxhp
I've found Tweetbot to be rather stable for an alpha release, and I think that Tapbot's strategy in releasing this early is to get people to fall in love with the app ASAP so that everyone will raise hell if Twitter takes action against third-party clients.
The killer feature for me is the ability to see the conversation around and replies to one tweet - this is extremely useful if you see one tweet between two people you follow but want to know the context around it, or if you want to see how other people have replied to a particular tweet.
It's pretty ridiculous since this has been happening for months on end now, and it didn't use to happen with the initial release. Twitter's OS X dev department just plain sucks - which is especially trying given that ML integrates Twitter into the OS. They need to step their game up ASAP - and definitely allow 3rd party devs and apps into the twitter ecosystem, because theirs just are simply not up to scratch.
Edit: Nope. I was wrong. I see the nib files. It's AppKit. They just use a hell of a lot of Core Animation.