At first it was Red Hat Linux (till version 10).
Then Red Hat prefered to move towards a totally commercial way shutting down RHL distribution (and only offering Red Hat Enteprise Linux).
Meanwhile it sponsored a volunteers evolution of RHL: Fedora distribution.
Now Red Hat changed its mind again and announces Red Hat Desktop Linux, which is a commercial distribution.
Apart all these evolutions, what is really interesting is that RH is going to include VMware Workstation inside this new distribution.
RH decided this move to simplify users migration from Windows systems to Linux ones, thinking the same way Microsoft did when acquired Connectix: Red Hat hopes Linux users will run their not-yet-ported Windows applications inside VMware, Microsoft hopes Windows users will run their legacy applications inside Virtual Server.