HTML5, Standards and Developer Features in Microsoft Internet Explorer 8
I started using IE again after IE7 mainly because of its speed and the fact that it has copied all the nice features (Tabs) of Firefox <smile />
IE8 has got some nice developers features (JavaScript debugger with Breakpoints, Native Json support, CSS3 selector to name few) and this video from MSDN Channel 9 is must watch to learn about them; a presentation full of demos by Giorgio Sardo at Microsoft Unplugged!
If you are lucky and using ASP.NET; dont forget to check out Web Application Toolkit at MSDN Code Gallery featuring ASP.NET controls for IE8!!