Twitter has a new CSS framework, named Bootstrap, that they launched recently, which includes things like grids, custom form styles, tooltips and popovers, etc..
Bootstrap is a toolkit from Twitter designed to kickstart development of webapps and sites. It includes base CSS and HTML for typography, forms, buttons, tables, grids, navigation, and more.
It supports modern, standards-compliant browsers, but I imagine some of the niftier features would probably break down on older ones. That would be a big issue if you wanted to use Bootstrap for an ordinary website, but less so for “web apps,” where it’s more common to assume a user has a modern browser.
I haven’t tried Bootstrap yet, but you can give it a test run by hotlinking the 7kb minified CSS from their GitHub repository. Or download the LESS files from the repository if you want to customize it.
Bootstrap from Twitter [Twitter Developer Blog]

Here is a good reference to start Twitter Bootstrap tutorial :
http://www.w3resource.com/twit.....torial.php
Heya,
Just thought I’d let ya know about our WordPress plugins where it lets you quickly add the latest Bootstrap CSS file to the beginning of your WordPress pages.
It let’s you either hotlink to the github repo, or use it local from your server.
Check it out!
http://bit.ly/qRVL1i
Any feedback or suggestions, please feel free to drop me a mail or contact me through our website.
Cheers,
Paul.
Guys, check it out!
We now have WordPress Shortcode for nearly all of the Twitter Bootstrap elements. We just released version 0.8 of the plugin today and we’re hoping this will be a huge help for people looking to take advantage of the Twitter Bootstrap package.
Let me know what you think:
http://bit.ly/v02ZhL
Cheers,
Paul.
That’s neat. Can it do popovers and “block messages,” too?