Internet Explorer 8 Beta 1 available!
Internet Explorer 8 Beta 1 was just announced at MIX08 and the IEBlog has the lowdown on the improvements they have concentrated on for this release, including full CSS 2.1 support, better scripting performance, the beginnings of HTML5 support, built-in developer tools, automatic crash recovery, and a new feature called "WebSlices" (this is similar to something that I've always wanted to hack up into a Vista Sidebar gadget!)
Download it now while it's hot :)
There is an IE7 emulation button that kicks the browser back into IE7 rendering/scripting/etc mode. Hopefully this will behave just like you would expect IE7 to behave, but of course it's beta software so who knows how reliable it would be for actual IE7 testing, hah... I've only tried it in a virtual machine so far, I'm not game to install it on my development machines just yet :)