One of the most effective ways to amplify your message on Twitter is to get your followers to retweet it to their followers. Retweeting is also becoming a popular way to pass links around Twitter. They are becoming the new currency of the Web because of the power of passed links.

the retweet buttons will begin supporting URL shortening service other than bit.ly, and will include an option for sites to choose their own custom short URL

Tweetmeme will also offer analytics for site owners to see how their retweets are spreading

All of this, of course, also turns into valuable data for Tweetmeme to determine the most popular links and stories on Twitter, and makes Tweetmeme itself a better news aggregation site