Safari140 - a Safari plugin that adds simple tweeting to Apple’s browser - was released last night. It’s activated using Control+T and automatically fills in the title of the current page and a shortened URL, using the is.gd service.
After using it this morning, I do like how much smoother SAfari140 makess sharing a link, but I don’t see this replacing Twitterrific on my Macs. Go check it out - the price is right, at least - $0.