Twitter is rumored to be launching a new Tweet Button potentially this month. The Tweet Button would provide the same functionality that we are accustom to with the Tweetmeme buttons. Since Twitter will be aggregating the data, you should be able to see a more comprehensive look into the sharing stats for links being shared. The new Tweet Button will allow web site owners to easily insert a single line of code to enable the button. The button will be offered in three sizes, 110×20, 55×20, 55×63.
Mashable's article, "Twitter Launching Official Tweet Buttons This Week [Exclusive]", has an example of the embedded button as well as some additional screen shots with additional information about the new service.