Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
The hills and bicycle and all the other nice stuff in the header of the new redesign completely disappear in IE 8:
What it's supposed to look like (Chrome):
What it looks like in IE 8:
Confirmed, I can repro with IE9 in IE8 mode (via the f12 developer tools).
We no longer officially support IE8, and this problem doesn't affect the functionality of the site.