Red Hat are cool. They also employ some of the most prominent GNOME hackers and community members we have.
Also, Red Hat own and host most of our servers, and have done so since the beginning of GNOME (afaik). Without their love (and ultimately sponsorship), GNOME would probably not be as far along as it is today.
Red Hat rocks. Never let it be said otherwise.
I'm sure there are lots more good things to be said about them. This is an editable wiki page, after all.