Today, Opera launched Widget SDK, enabling web developers to deploy web apps on desktop, TV and mobile devices. Unlike Apple’s iPhone $99 SDK, it is free of charge.

Watch the step-by-step instruction video:

More Mobile App/Widget SDKs:

• Apple: iPhone SDK
• Google: Android SDK
• Yahoo!: Blueprint SDK (this is what I am working for)
• Nokia: Widset
• Openwave: Mobile Widget
• Plasmo: Widget

Looks like Opera Mini 4 is now official. I just updated Opera Mini on N95 and played around.

Although I don’t know if there’s any new features added from Beta 4, the nice new features added for 4 (compared to 3) includes “mini” version of the entire web page, just like Nokia’s WebKit, and landscape mode.

The page rendering speed seems to be just as fast as I expected - faster than WebKit.

As long as I’ve been testing on the beta and now this official 4, as a web developer, I am happy with the improvement on CSS support. So many pages that looked like crap on Opera 3, are now beautifully rendered. It supports better table layout and more semantic markups (Now, I can use the strong, H1 tags etc. without making terrible mess) and CSS3 including media queries. Although limited, it supportes some JavaScript events as well.

Also, Opera launched a developers’ community site called Dev Opera recently, to help us developing better on Opera.