We’ve all seen the Digg buttons on websites and blog publishers to encourage their audience to submit or digg their content on Digg. Lately you may have noticed a shift from Digg buttons to Retweet Buttons by TweetMeme!
The retweet button encourages blog audiences to retweet the content on twitter. Its available in standard javascript code snippets, much like Digg’s, as well as a WordPress plugin - Which I need to install 
I can easily see this capturing a large share of blog real estate which currently belongs to Digg. As more and more surfers of the intertubes turn to Twitter for their ‘news’ this will become the fastest way to spread your blog post message.
It will be interesting to continue to watch this movement as it evolves.