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Just like with every new version, Opera claims significantly faster browsing and improved standards support, so you can just choose whether you'll believe them or not. But there are some other important innovations in this version.
First of all, Opera's developer tool set, Dragonfly, is now cross-platform and better than ever. From the official press release:
"It allows developers to debug JavaScript, inspect Cascading Style Sheets (CSS) and the Document Object Model (DOM), and view any errors, making development for the mobile phone even easier."
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Of course, have in mind that this is a beta release, so expect some bugs and glitches. If you're feeling brave, go over to the download page, and tell us what you think of the new version.