I found nice jQuery plugin for generating QR codes written by Jerome Etienne: jquery.qrcode.
It’s fairly easy to use. Just pass a text to function and QR code is ready:
jquery('#qrcode').qrcode("this plugin is great");
Here is small application that generates QR codes on the fly as you type.
You can also download QR code as image (use: Chrome, FF, Opera or Safari for download).
Link to standalone QR code HTML5 application.
Three.js is amazing 3D library written in JavaScript.
Eberhard Gräther wrote very interesting port of old Minesweeper. Now you can play it in 3D space 
Checkout Ebehard’s web site. You can find there other cool examples of WebGL and JavaScript. Like this one:
I was searching for a web based music note editor. I found HTML5 Cloud Composer from Greg Jopa.
Then I found something more like good old FastTracker: Sonant Live composer.
You can use Sonant Live composer to create tracks with music.
What is even more interesting about this composer is that you can store your song into pure JavaScript file and replay it with js-sonant.
The princeple of js-sonant is quite simple. You just store music structure into song variable and then you call createAudio. It will produce HTML5 audio object with wav rendered from your song tracks.
Here is sample code:
var songGen = new sonant();
for (var t = 0; t < 8; t++)
{
songGen.generate(t);
}
audio = songGen.createAudio();
audio.loop = true;
audio.play();
Here you can play my simple attempt to make music.
Note: Your browser must support HTML5 audio in order to play this music. Browsers which have support for HTML5 audio: Google Chrome, Firefox, Opera, Safari.
Note 2: Please wait few seconds after you clicked the Play button. You browser will render JavaScript music notation into playable Wav.
You can find here slides from my talk about security in context of RIA applications.
Conference EurOpen.cz – Želiv. Slides are Slovak only.
When you want to exchange data between Flash Player and JavaScript then you can use ExternalInterface.
There are two issues that you should be aware of:
1. Binary data must be encoded.
You could not send binary data directly from JavaScript to ExternalInterface. Data will be garbled. You have to encode it e.g. using Base64.
2. Send small chunks of data.
When you need to send 2 MB via ExternalInterface, you need to chop it into smaller pieces. E.g. 256 KB. Bigger chunks cause big load and it slows down transfer.
It takes 15 seconds to transfer 2 MB big chunk in Google Chrome 11. When you chop 2MB into 256 KB chunks, then it’s less than second.
I was invited to give another talk at FRI Žilina. Previous topic was development for Google Android platform.
This time I focused on jQuery.Together with Michal Kaukič we started jQuery workshop. Attendees learned basics of jQuery in two hours. At the end they have running application with simple animation in HTML.
You can download slides in PDF version.
You can also download ZIP file with all demo applications.
I was using IntelliJ Idea IDE. It has very intelligent code completion for jQuery, JavaScript and HTML.
I suggest to download also jQuery Cheat Sheet, it is very handful manual.
I mentioned two interesting projects. One was Adobe Browser Lab which allows you to get snapshot of your web site displayed in different browsers on different systems.
The second project was jQuery Mobile. This project could help you to create applications for mobile environment.
I provide this workshop also in form of training for companies. You can find more details about available trainings at sinusgear.com.
Do not forget to watch lauch of Adobe CS5.5 Dreamweaver. Adobe promised to provide support for packaging JavaScript application as a native app for Apple iOS, Google Android and Blackberry.
Akú JavaScript knižnicu by ste zvolili pre tvorbu 2D plošinovej hry?
Pre C/C++ je možné použiť Allegro alebo SDL. Pre Flash/Flex je výborný Flixel.
Čo ale v prípade JavaScriptu?
Narazil som napríklad na Game Query. Aké sú vaše skúsenosti a čo by ste odporučili?
Update: Zdá sa, že JavaScript ako nástroj na tvorbu hier, nie je medzi čitateľmi tohoto bulvárneho plátku príliš zavedený. 
Dovolím si pridať odkaz na zaujímavý portál, ktorý poskytuje priamo nástroje pre tvorbu JavaScript plošinoviek: EffectGames
Občas je potrebné do webu pridať nejaké funkcie podporené JavaScriptom. Otázkou je, kde hľadať knižnice?
Jedným z nástrojov, ktorý zjednodušuje hľadanie je Adobe Widget Browser.
Malá aplikácia, ktorá sa napojí na Adobe Exchange a získa odtiaľ prehľad dostupných widgetov.
Widget a jeho kód je možné priamo v aplikácii rýchlo otestovať.
Ak máte vlastný widget, môžete ho zverejniť na Adobe Exchange, stačí dodržať pár pravidiel.
Pokiaľ ste to ešte stále nepostrehli, doba sa nám mení.
K tomuto sa viaže aj projekt CodePlex.com, čo je vlastne taký code.google.com a sf.net v podaní Microsoftu.
Medzi zaujímavými projektami je tu možné nájsť napríklad Ajax Control Toolkit.
Zaujímavé video na tému open source a Microsoft:
