You've probably noticed something to the right of the text of each entry: a "retweet" button which allows those with Twitter accounts to post the title and link to the entry. And it's on not just this blog, but my project and opinion blogs as well. TweetMeme provides the service.
Most people I know find Twitter useless, but I'm one of those select few who get a lot of use out of it. I myself retweet articles and posts quite often. For those like me, I've provided the button.
Turns out that Blogger does not provide an easy way to put the button in — no Google Gadgets exist for this. I found out about this on Twitter. @cheth posted a link to his tutorial, and in it he links to TweetMeme's instructions. Instead, I Googled up "add retweet button to Blogger" and found the instructions I actually used, on this page in @virtuosoblogger's blog. I followed the instructions and inserted the code into my blogs' templates.
So that's how I managed to add that retweet button you see to the right. Who knows? I might add another such service if I deem it useful enough...