Today, Twitter unveiled their service called 'Blackbird Pie', which should make it easy for anyone to quote tweets in their weblog. Not so much. It stills requires going to another site to get the HTML. Fortunately a third party developer decided to create his own solution, which allows for automatic(!) including of tweets.
EmbedTweet makes it easy to embed tweets into your website. Include one piece of code and all your tweet-links will automatically be converted into interactive representations of the actual tweet. It's like YouTube's video embed for tweets!