Using the BlogThis! Chrome extension, you can start writing a blog post in one click. Whenever you are inspired by a web page you are looking at and want to blog about it, just click on the BlogThis! button on your Chrome toolbar, and the Blogger post editor opens up with a pre-populated link to the web page you were on. If you want to include any text in your post, simply highlight it before clicking on the BlogThis! button. Edit the post as you'd like, and publish it instantly or save it as a draft for future posting.
To try out the BlogThis! Chrome extension, first switch to Google Chrome BETA (if you are not already on that version), and install the BlogThis! extension by clicking on "Extensions" on your browser toolbar or visiting the BlogThis! extension homepage. Note: Extensions are only available for Chrome on the PC and Linux; Extension support on Chrome for Mac is under development.
Source : http://buzz.blogger.com/2009/12/one-click-blogging-with-blogthis-chrome.html