First public beta of Windows Internet Explorer 9 is going to be released in 7 days from now on September, 15, but it seems the IE9 Beta Installer is now leaked outside Microsoft as a website claimed to have the setup also posting the video below demoing the release.

Microsoft is trying hard to keep it's bigger share of web-browser market-share pie, facing tough competition from rivals like Mozilla Firefox, Google Chrome and Opera.

Microsoft Internet Explorer 9 is showing some steady and impressive progress as the development cycle is inching towards a public beta release, Microsoft is emphasizing support for modern web on IE9 platform capable of delivering rich HTML5 experience that feel more like native applications than websites - supporting hardware-accelerated SVG, canvas, audio, video,and text, IE9 will be harnessing full potential of the PC to achieve best performance.

To further strengthen the ultimate goal of an fast, modern, web-browser IE9's fourth developer preview is now available for download with support for fully hardware-accelerated HTML5 and new test-drive demos showing modern SVG and native JavaScript integration in action.

The web-browser war is once again going to get interesting with Internet Explorer 9 Preview now available for public download promising impressive upcoming features, boasting 100% support for W3C Web Standards (see comparison table after the jump) IE9 will support hardware assisted page rendering, background compiled JavaScript and GPU-powered HTML5 graphics for superior performance.

We wrote about Microsoft preparing to release IE8 Beta 1 yesterday, and they released it today (link at the end of the post), Interestingly enough Firefox 4 Alpha 1 also got released today, the browser war seems all set to heat up once again.

Internet Explorer 8 looks promising this time, but Firefox is surely taking the lead, with Firefox 4 supporting Javascript 2 already into the pipeline, the future seems to be with Firefox.