User interface-wise, the Opera team has taken a few cues out of Google Chrome's handbook, which can only be seen as a good thing (at least, when you're a Chrome fanboy like myself). Tabs are now 'on top', the menu bar has been replaced by a single button, Aero Glass is fully supported, as are jump lists, Aero peek, and one-taskbar-entry-per-tab. This greatly improves the integration between Opera and Windows 7.
"Opera 10.50 is the fastest browser in almost all speed tests," said Lars Boilesen, CEO at Opera, "But, more important than any speed test is the real-world speed during use. We designed Opera 10.50 to be easy to use, while making our unique features stand out, so you can get more out of the Web."
You can download it from the Opera website, or, as they gleefully point out, through that browser ballot choice whatever thing in Windows. Linux and Mac versions are coming soon.