“The web is responsive on its own—by default. It's us that's been breaking it all these years by placing content in fixed-width containers.”

Simple tooltip without JS:

<a href="#" data-tooltip="This is a tooltip!">a link</a>

a:hover:after {
content: attr(data-tooltip);
}

Responsive Nav — a responsive navigation plugin without library dependencies and with fast touch screen support:  http://responsive-nav.com 

Swipe.js - a lightweight mobile slider with 1:1 touch movement, resistant bounds and scroll prevention http://t.co/kfFN4PPa

Convert PNGs to CSS Gradients with pngtocss http://t.co/8fneeDM

Easy way to create input tooltips without JS:

<input data-tooltip="This is a tooltip!">

input:focus:after { content: attr(data-tooltip); }

Adaptive Images - Automatically adapts your existing HTML images for mobile devices http://t.co/Ji5q397

Microsoft confirms that Windows Phone 8’s strange behavior with CSS Device-Width is a bug, not a feature:  http://timkadlec.com/2013/01/windows-phone-8-and-device-width/ … via @tkadlec

Device viewport widths of 173 mobile devices (in both portrait and landscape), collected by @stowball:  https://docs.google.com/spreadsheet/ccc?key=0AoUAJWmYgaHHdHZZWWpPQkx4eHpBaUxna3dyMGkzLUE#gid=0 …

jQuery plugin that calculates the font-size and word-spacing needed to match a line of text to a specific width http://t.co/aFXlBozu

It's called 'Remote Preview' and it allows you to preview any URL on large number of mobile devices simultaneously:  https://github.com/viljamis/Remote-Preview …

Responsive Navigation Patterns: http://t.co/VkJPSSmY an in-depth look into responsive web design navigation techniques via @brad_frost

Me, writing JavaScript  https://dl.dropbox.com/u/2206960/GIF/try%20and%20error.gif …

URL Design: http://j.mp/hDn73O

MQtest — A simple tool to help identify which media queries your device responds to  http://mqtest.io 

Maintaining CSS Style States using "Infinite" Transition Delays http://t.co/WpiJ353C

I wrote an article to Smashing Magazine: “Establishing An Open Device Lab” http://t.co/BFMRQBoX

I wrote down some thoughts about typography, rhythm and responsive design http://t.co/tIEUDd2T

TinyNav2.js v0.2 out:  https://github.com/viljamis/TinyNav2.js … adds aria-hidden on resize and toggle (thanks @stowball) + some other fixes.

Helsinki Open Device Lab has a site now: http://t.co/uOQ1GIcC . Rough around the edges, but it’s a beginning. /cc @adactio @smashingmag