At MIX 06 the IE Team mentioned there is now available for download a preview of Beta 2. This version of IE7 is “Rendering Behaviour” complete. This basically means that the additions will be more on fixes/security but in regard to how your pages will render in Internet Explorer 7 you are now free to test your CSS sites and find out. Eric Meyer had some words on IE 7 and Expression on his website.
SharePoint is a great platform for building web based business applications which leverage it's out of the box features like search, business intelligence, document and records management. Customizing the look and feel takes some effort but stick around as I will share the tips i've picked up over more than 10 years designing SharePoint sites.