Need reasons to love Bootstrap? Look no further.
Built at Twitter by @mdo and @fat, Bootstrap utilizes LESS CSS, is compiled via Node, and is managed through GitHub to help nerds do awesome stuff on the web.
Bootstrap was made to not only look and behave great in the latest desktop browsers (including IE8+), but in tablet and smartphone browsers via responsive CSS as well.
For even more sites built with Bootstrap, visit the unofficial Tumblr or browse the examples.