Now your readers can have an easy way to tweet about your blog postings too: New Twitter “Tweet Button”.
From the post by Andy P (wordpress team):
New Twitter “Tweet Button”
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When one of your readers hits the Tweet Button, they will be shown a popup that includes a shortened link to your post. Readers can add in a quick message, and then hit “Tweet” to send the post to their Twitter feed as a tweet — all without leaving your blog.
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To enable the button on your blog please visit the “Appearance > Extras” menu and select the “Show a Twitter Tweet Button on my posts” option.
Edit: 20100901:
The WordPress team has moved the Twitter Tweet button into Settings > Sharing. In addition to that, they added sharing mechanisms for FaceBook, Press This, Reddit, Digg, StumbleUpon, Email and Print.
In addition to those, you can define your own sharing methods.
You can read more about this move here.
–jeroen
via: New Twitter “Tweet Button” — Blog — WordPress.com.